Agates Lexicon

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ID Agate
2735Tabasco Geodes, Tabasco, Zacatecas Mexico, usually small quartz geodes according to Cross (1996, p. 112, 113).
2736Tabaseca Tank, California. The U.S. Geological Survey geographic names data base shows a Tabaseca Tank at 33o 30' 59" N and 115o 32' 45" W, Riverside County, California.
2737Tabeska Tank Agate, California, no description, Perry (1961, p. 312). This is probably a misspelling for Tabaseca Tank, above.
2738Table Rock Mountain Agate, Oregon, local name, for Table Rock Mountain, Southwestern Oregon. The Mineralogist, v. 21, no. 12, p. 462. Table Rock Mountain does not appear in Geographic Names Information System.
2739Tabu African Jasper, Africa, no description, probably the same material as Tabutabu jasper below, adv., Riviera Lapidary center, Lapidary Journal, v. 38, no. 11, p. 1448.
2740Tabutabu jasper, no locality, probably Africa,...brecciated jasper and agate, ...reds, whites, and blacks, adv., Riviera Lapidary Center, Lapidary Journal, v. 34, no. 6, p. 1397.
2741Talaloc Agate, misspelling of Talloc Agate?
2742Taloca Agate, Mexico, misspelling of Talloc Agate?
2743Talloc Agate, Mexico, extremely colorful lace agate, with black matrix and red lace, adv., Goodnow Gems, Lapidary Journal, v. 29, no. 3, p. 555.
2744Tamaka Geodes, Chihuahua, Mexico, name appeared in adv., Gem Center USA, Lapidary Journal, v. 45, no. 1, p. 268. CrossÆs (1996, p. 113, fig. 77f) illustrated example is a thunder egg. Cross recorded the type area near Estacion Trancas, Aldama, Chihuahau; he stated they commonly contain finelyi crystallized drusy quartz
2745Tamborine Mountain, southeastern Queensland, Australia. See Doon Doon thundereggs, Bryan (1962)
2746Tampa Bay Agate (=Tampa Bay Agatized Coral), Florida, term used by Zeitner (1964, p. 345).
2747Tampa Bay Agatized Coral, Florida, for Tampa Bay, 27o 41' 18" N and 082o 34' 21" W, Hillsbortough County, Florida, Cockroach Bay Map, USGS 7.5' x 7.5', yellow, clear, brown, black, and white marine sedimentary agate found essentially in place in the Tampa Formation of early Miocene age as mapped by Johnson (1888) and Dall (1892) who mentioned the chert of the Hillsoborough River as the only cherty phase of the Tampa. The Tampa Formation was named for exposures at Tampa where it underlies the town and at other places around Tampa Bay. Lewis (1947a, p. 138) recorded it as chalcedony after coral. Sinkankas (1959, p. 339) stated that this coral has been produced for gem purposes since 1825. Zeitner (1964, p. 345) stated the classic localities of Ballast Point and Davis Island were now inaccessible and that current sources relied on new excavations, and she further referred to this site in 1976 (p. 960-962). Strom, Upchurch, and Rozenweig (1981) have published a detailed study dealing with subaerial silicification on the origins of these agatized corals, and Pabian and Zarins (1994) considered them to be marine sedimentary agates that were products of silica diagenesis in alkaline conditions.
2748Tampa Bay Agatized Coral, Florida?, no description, adv., Jacks Rock Shop, Rocks and Minerals, v. 35, no. 1,2, p. 67.
2749Tampa Bay Coral, term used by Zeitner (1976, p. 962-970), synonym of Tampa Bay Agatized Coral, which see.
2750Tank Peak Jasper, Colorado, Barb (1958, p. 201) used this term for jaspers from ATank Peak,@ south of Dinosaur National Monument, Moffat County, Colorado. He suggested this material originated in the Morgan Formation of Pennsylvanian age and that it was the same as Douglas Mountain jasper; thus a synonym.
2751Tarbaby Agate, Alabama, Georgia, California?, black, purple, Mayo, Rocks and Minerals, v. 48, no. 1, p. 63. Frazier and Frazier (1988) suggested the term referred to dark, petroliferous residues in agates; this usage is consistent with the practice of calling geodes that contain tar Atarbabies@.
2752Tasmanian Agate, Tasmania, Feehan (1979, p. 166-174).
2753Tasmanian Jasper, Tasmania, banded to wood grain appearance, adv., Minerals & Gems, The Mineralogist, v. 26, no. 9, p. 21.
2754Tatui Agate, for Tatui, Rio Grande do Sul, Brazil (Mattos, 1974, p. 5).
2755Tecopa (precious opal) for outcrops near Tecopa Hot Springs 35o 52Æ 22ö N and 116o 13Æ 53ö, Inyo county, California, tecopa Map, U.S. Geological 7.5Æ topographic.
2756Teepee Agate, South Dakota, probably a synonym of Teepee Canyon Agate, S.D., red agate swirls, adv., Crystal Rock Shop, Lapidary Journal, v. 14, no. 1, p. 156; adv., Cycad Shop, Rocks and Minerals, 28, no. 3,4, p. 185. Zeitner, J. C., 1957, The Fairburn Agate, Earth Science, v. 10, no. 1, p. 11-13; 1959, Where to go in South Dakota, Lapidary Journal, v. 13, no. 1, p. 42-54; 1959, p. 42-54; 1960, Rare gems of the Midwest, Earth Science, v. 13, no. 2, p. 58-62. saf, 1988, p. 77, synonymizes this with Hell's Canyon Agate, check out.
2757Temskya? (?Tempskya), no locality, no description, adv., International Gem Corporation, Rocks and Minerals, v. 34, no. 11,12, p. 530.
2758Temskya Agate, no locality, rare fern wood, adv., International Gem Corporation, Lapidary Journal, v. 13, no. 2, p. 289.
2759Tempskya (fern), western interior, United States,fossil fern found in lower Cretaceous deposits, usually preserved agatized false trunks that are formed by stems and roots growing parallel to one another Tidwell (1975, p. 125, 126). Agatized examples or reworked Tempskya have been found in stream deposited gravels of the basal Chadron Formation of Oligocene age (Pabian, 1970, p. 84, 85)
2760Tempskya Agate, no locality, no description, adv., International Gem Corporation, Lapidary Journal, v. 12, no. 4 p. 489.
2761Tennessee Agate, Tennessee, term used by Zeitner (1973, p. 484-498).
2762Tennessee (Carnelian) Agate, Tennessee, colored to carnelian, amber, or smoky agate from Ordovician limestones in Tennessee's Central Basin, Owen (1962, p. 46-55).
2763Tennessee Jasper, Tennessee, no description, adv., Royston's Rock Shop, Lapidary Journal, v. 28, no. 7, p. 1143.
2764Tennessee Moss Agate, no description, adv., Murphy=s Rock Shop, Rocks and Minerals, v. 38, no. 11,12, p. 655.
2765Tenorite (Chrysocolla, inclusion in chrosycolla?), no locality, adv., W. Scott Lewis, The Mineralogist, v. 6, no. 6, p. 23.
2766Tepee Canyon Agate, South Dakota, a marine sedimentary, banded agate that has been recovered from chert nodules within limestones of middle Pennsylvanian (Desmoinesian) age. The agates are named for Tepee Canyon, 43o 33' 03" N and 103o 57' 02" W, Custer County, South Dakota, Jewel Cave SW map, U. S. Geological Survey, 7.5' x 7.5'. The agates are similar to Hell Canyon Agate which runs just east of and nearly parallel to Tepee Canyon. At this writing, it has not been established which names (Hell Canyon or Tepee Canyon) was used first but it appears that the agates from the two sites are environmentally and stratigraphically related. The orthography has not yet been established but early usages use the spelling Teepee Canyon. See also Shaub, M. S., (1958, p. 394-397, 437), Shaub, B. M., (1980a, p. 650-659, 670-679) and Zeitner, J. C. (1957, p. 11-13; 1959, p. 42-54) and Clark (1998).
2767Teredo Wood, Washington?, adv., Herb Brown Rocks, Earth Science, v. 7, no. 1, p. 38.
2768Territulla Agate, Wyoming, misspelling of Turritella Agate, used by Green, S. N. (1948, p. 135) In All American Gem Eleven, Hobbies, January 1948, v. 52, no. 11, p. 135.
2769Tetla Crazy Lace Agate, Mexico, ...from Juan Noriega's original claim, adv., Tetla, Lapidary Journal, v. 31, no. 1, p. 167. This may be a modifying term for the first production.
2770Texas Big Bend Agate, Texas, plume, moss, banded agates, adv., Edith Owens, Lapidary Journal, v. 5, no. 1, p. 85. Probably includes material from Marfa, Alpine, and Big Bend region, rkp.
2771Texas Biscuits, Texas, no description, adv., Odom's, Lapidary Journal, v. 5, no. 4, p. 236. This term is commonly applied to small plume agate nodules from various localities in west Texas because they are to be cut in the same fashion as a biscuit, that is...the flattest dimension along the long axis of the nodule. The term was supposedly coined by the late Frank Woodward, Sr.
2772Texas Bloodstone, Texas, Zeitner (1972, p.984) used the term to describe a green jasper with a few red dots, but not in the form of the small red dots found in classic bloodstone.
2773Texas Bouquet Plume, Brewster County, Texas, probably from Woodward Ranch, adv., Woodward Ranch, Lapidary Journal, v. 32, no. 1, p. 429.
2774Texas Fortification Agate, Texas, no description, adv., El Paso Rock & Lapidary Supply, Texas, The Mineralogist, about v. 15, check out
2775Texas Gem Agate, Texas, adv., Frank Duncan and Daughter, Earth Science Digest, v. 2, no. 2, p. 3. Mossy, variegated agate, no locality given, adv., Frank Duncan & Daughter, The Mineralogist, v. 14, no. 6, p. 316. May be synonym of Rio Grande agate.
2776Texas jasper-agate, Texas, no further details, adv., Frank Duncan & Daughter, The Mineralogist, v. 15, no. 8, p. 424.
2777Texas Palm, no locality, no description, adv., T-C Rock Shop, Sevier, Utah
2778Texas Panhandle Petrified Wood, Texas, no description, adv., T.D.'s Lapidary, Lapidary Journal, v. 31, no. 1, p. 257.
2779Texas Plume Agate, Texas, see Zeitner (1971, p. 4-22). Fraser and Fraser (1990, p.77) suggested Woodward Ranch, near Alpine, Brewster County, as the locality, but the term may be generic to the west Texas area. Zarins (1976) recorded similar plume agates from several ranches in the Alpine, Texas area.
2780Texas Plume Beds, red and black bleeding plume, colored picture mosses, adv., El Paso Rock & Lapidary Supply, Lapidary Journal, v. 1, no. 2, p. 59
2781Texas Plumes, Texas, adv., Woodward Ranch, Box 453, Alpine, Texas, Earth Science Digest, v. 4, no. 8, p. 28.
2782Texas Red Agate, Texas, a red brecciated agate cemented with blue agate (Slack, 1966, p. 80), who in the same paper on p. 87 and 88 described them as nodular agates with red jasper cemented with gray fortification agate.
2783Texas "Rose" Agate, Texas, flesh pink, bluish roae, mauve, carnelian, adv., Frank Duncan & Daughter, The Mineralogist, v. 14, no. 3, p. 134.
2784Texas Scenic Agate, Texas, no description, adv., Dr. A.R. Ploudre, Lapidary Journal, v. 37, no. 10, p. 1436.
2785Texas Springs Limb Casts, Nevada, for Texas Springs, 41o 46' 24" N and 118o 25' 54" W, Humboldt County, Nevada, Shyster Butte Map, U. S. Geological Survey, 7.5' x 7.5'. usually pink or white casts, usually of roots rather than limbs. The locality is sometimes called Jackpot. These wood casts probably originated in the Rhyolite Formation of Miocene Age or the the 1000 Springs Formation of Oligocene Age. See JCZ et al.
2786Texas Springs Wood, Nevada?, no description, adv., BrysonsÆs Rock Shop, adv., Lapidary Journal, v. 42, no. 1, p. 226. May be same as Texas Springs Limb Casts, above.
2787Texas Thunder Eggs, Texas, ...only known thunder egg beds in Texas, adv., Odom's, Lapidary Journal, v. 3, no. 6, p. 468
2788Texas Wood Opal, no locality, no description, ...adv., American Mineral Exchange, The Mineralogist, v. 4, no. 3, p. 42.
2789Tex-Mex Jasper Agate, no locality, no description, adv., Dowell's, Edinburgh, Texas, Lapidary Journal, v. 13, no. 2, p. 325.
2790The Sump, Nevada, agatized wood site listed by Strong (1978, p. 46-49); the name does not appear in Geographic Names Information System.
2791Thistle Agate, Needle Peak area, Brewster County, Texas, translucent gray to green agate with miniature white pom-poms (Zeitner, 1962, p. 528). Slack (1966, p. 85, 86, 95) described these as Pom Pom agates with fine white sprays combined with yellow sagenite; color illustrations. See also "Porcupine Thistle".
2792Thistle Creek Sagenitic Agate, for Thistle Creek, Oregon, 44o 28' 15" N and 122o 30' 44" W, Linn County, Oregon, Green Peter Map, USGS 7.5' X 7.5'.
2793Three Rivers, Texas, Texas, locality listed by Morgan (1978, p. 1974).
2794Thumbnail Agates, ...a term generally used to describe agates or any other mineral or fossil that is not microscopic but can fit into a one inch cube. ..miniature agates up to 3/4 inch, adv., South Bend Rock Shop, Lapidary Journal, v.21, no.11, p. 1389.
2795Thunder Bay Agate, name given to agate from a commercial mine that operates just east of Thunder Bay, Ontario, Canada. The agate appears to be a vein agate . No further details.
2796Thunderbird Park, Australia, a fee locality for collecting thunder eggs in southern Queensland (Cadle, 1972, p. 1039).
2797Thunder egg, a popular term for a small, geodelike body of chalcedony, opal, or agate that has weathered out of the welded tuffs of central Oregon. Source, Glossary of Geology, American Geological Institute, 1972, p. 739. This distinction is geographic as term is used widely elsewhere such as in Australia (Bryan, 1962) although his title calls them expanded spherulites. The term Thunder Egg is reputed in popular discussion to be derived from a Native American legend of Gods on Mount Hood and Mount, Jefferson, Oregon, heaving thunder bolts at one another, the thunder eggs being products of these quarrels. I have found no evidence to support this claim. The Oxford English Dictionary shows terms such as thunderstones and eagle stones appeared in the English Language by the 15th Century and the term may not be unique to any ethos or mythology.
2798Thunder Egg, cosmopolitan, Pabian and Zarins (1994, p. 7-9). Primary agate to form in agatization cycle from silica caused to spherulitically crystallize when coming into contact with alkaline minerals in solution. They treated thunder eggs as stratigraphic, geochemical, or environmental entities.
2799Thunder egg, see also Thunder-stone. go to OED, rkp.
2800Thunder Egg Yolks, New Mexico?, no description, adv., James T. Lawyer, Earth Science Digest, v. 9, no. 1, p. 31.
2801Thundering Herd Ranch Agate, ...white plume agate on pale background, (Chenard, 1962, p. 106). Thundering Herd Ranch is situated at 35o 00' 48" N and 117o 48' 36" W, Kern County, California.
2802Thunder-stone, a term applied to various stones, fossils, etc. formerly identified with 'thunderbolts', as celts, belemnites, masses of pyrite, meteorites. Source: Oxford English Dictionary, 1989. The OED references cite Maundrell (1703) ...each tube had a small cavity in its Center, from which its parts were projected in form of rays, to the circumference after the manner of Stones vulgarly called Thunder-stones. Journal of Jerusalem, 1721, p. 52. Maundrell's description is apparently that of a sagenitic agate. Morse (1796, American Geographer II, p. 16) ...Norway produces amethysts, agates, thunder stones and eagle stones. This appears to relate this group of stones. Hence, thunder-stone may be a precursor to the modern term thunder egg.
2803Thuringian Forest Agates, Germany, thunder eggs from the Rotliegend-rhyolites and -rhyolite porphyries of Permian age that are exposed in the Thuringian Forest, East-central Germany and that have been recorded by Holzhey (1997, p. 452-459) who suggested that silica was mobilized as a result of metasomatism and that the agates formed at temperatures mostly below 100o C.
2804Tibara Opal, California?, no description, trade name?, adv., The House of Tibara, Lapidary Journal, v. 34, no. 1, p. 265.
2805Tick Canyon (Agate) , California, for Tick Canyon (see below for location details). Berkholz (1962, locality 20) recorded agate nodules and bloodstone from this site
2806Tick Canyon breccia jasper, California, for Tick Canyon, 34o 27' 35" N and 118o 22' 30" W, Los Angeles County, California, Agua Dulce Map, USGS 7.5' x 7.5'. details, adv., Christie Conway, 3507 West 115th Street, Inglewood, California, The Mineralogist, v. 17, no. 10, p. 473. See also Schwartz, 1942, p. 384).
2807Tick Canyon green jasper, California, for Tick Canyon, 34o 27' 35" N and 118o 22' 30" W, Los Angeles County, California, Agua Dulce Map, USGS 7.5' x 7.5'. California, no details, adv., Christie Conway, 3507 West 115th Street, Inglewood, California, The Mineralogist, v. 17, no. 10, p. 473.
2808Tiger Agate, Arizona, ...yellow and black, illustrated in Jones (1977, p. 92).
2809Timberline Lake Agate, Missouri, no description, adv., Timberline Lake Development, Lapidary Journal, v. 12, no. 6, p. 717. This material may be identical to "Mozarkite" and if so, Timberline Lake predates it, rkp.
2810Timberline Lake Missouri Agate, Missouri, ...colorful Missouri Agate, on Hwy. 65, about 25 mi. So. of Sedalia, adv., Timberline Lake Development, Lapidary Journal, v. 12, no. 6, p. 717.
2811Tin Can Alley, San Bernardino County, California, see Mule Canyon.
2812Tinkletop, Perthshire, Scotland, historic locality first mentioned by Heddle (1901, p. 76) ...of the most delicate tints of lilac, flesh-red, and rose, in grey-blue Chalcedony. Rodgers (1975, p. 40, 41) suggested that Tinkletop produced some of Scotland=s finest agates of unusual shapes but little is now found there. The agates came from lavas in the lower Old Red Sandstone of early Devonian age.
2813Tipton Petrified Algae, Wyoming, an agatized algae from the Laney Shale Member of the Green River Formation of Eocene Age near Tipton, Wyoming, Jackson (1971, p. 66).
2814Tomache Agates, Mexico, white to gray amygdaloidal agates, named for Tomache, Chihuahua, Mexico. Brad Cross (personal communications, Sept.23, 1995, and 1996, p. 95, 96) suggested that these were sometimes offered as Casas Grande agates in order for dealers to take advantage of a more recognizeable name.
2815Tomochi Morado, Mexico, ...reds, grays, purples, adv., Riviera Lapidary, Lapidary Journal, v. 30, no. 10, p. 2390. Mis-spelling of Tomache.
2816Tonopah Jasper, Nevada?, for jaspers from outcrops and alluvium near Tonopah, Nevada, 38o 04' 02" N and 117o 13' 45" W, Nye County, Nevada. See Johnson (1978, p. 30, 31) and Mitchell (1991, p. 94, 95).
2817Topographic Agate, descriptive used in allusion to concentric bands resembling contour lines on topographic maps. This refers to banded agate only. See Take, W. F. (1961, p. 339).
2818Torreon Agate, Mexico, ...various shades of green, white, tan, blue-green and brown and blue, adv., Goodnow Gems U.S.A., Rock & Gem, v. 4, no. 6, p. 3. ...Mexico, green, blue-green, blue, gray, white, and tan, various patterns. adv., Goodnow Gemns U.S.A., Lapidary Journal, v. 27, no. 12, p. 1775.
2819Tranquille Creek Agate, British Columbia, Canada, banded, plume and fortification agate, local name?, see Baker, S. G., 1960, B.C. Gem Trails, The Mineralogist, v. 28, no. 4,5, p. 66, 68.
2820Translucent Agate, with red lace or moss-like inclusions, no locality, adv., Ed? Freeman, Lapidary Journal, v. 1, no. 1, p. 40.
2821Trans-Mexico Agate, no locality, no description, adv., The Garbs, Lapidary Journal, v. 14, no. 1, p. 157.
2822Trans-Montana Agate, Brazil, black, blue, gray, white, brown, cream, to medium orange, black, and occasionally red dendrites---scenes that rival Montana Agates, adv., Lapidary Journal, v. 33, no. 1, p. 60.
2823Trapper Creek Agate, Wyoming, a local name for dendritic agate from Trapper Creek Agate Mine about 25 miles East of Shell, Wyoming, named for Trapper Creek, 443229N and 1074537W, Big Horn County, Wyoming, Shell Map, U. S. Geological Survey, 7.5Æ x 7.5Æ. See Walker (1990, p. 81-86).
2824Tree agate, India, adv., Murray American Corporation, Rocks and Minerals, v. 47, no. 7, 8, p. 455; Green tree pattern on white, adv., Murray American Corporation, Rock and Gem, v. 4, no. 1, p. 41; color illustration in adv., Harry Sering Co., Lapidary Journal, v. 32, no. 3, p. 678-679.,
2825Tree Agate, Mexico?, no details, adv., Gem Arts and Rocks, The Mineralogist, v. 28, no. 2,3, p. 22.
2826Tree Design Agate, India, descriptive term, probably a synonym of tree agate, ...white ground with tree-like, green designs, adv., Astro Minerals, Ltd., Lapidary Journal, v. 20, no. 6, p. 732.
2827Trent Sagenitic Agate, for Trent, Oregon, stibnite (dendrites?) crystals. Staples, L. W., 1950. The Mineralogist, v. 18, no. 10, p. 492, 494. Type locality probably in railroad cuts southeast of Trent in extreme northwest part of T. 19 S., R. 1 W., Lowell Quadrangle, U. S. Geological Survey, 7.5 minute series (Topographic), Lane County, Oregon. Sections are irregularly numbered, but railroad cuts are in sections 39, 41, 42, 49.
2828Trinidad Jasper, for Trinidad, California, green, red brecciated jasper, for Trinidad, 41o 03' 34" N and 134o 08' 31" W, Humboldt, County, California, Trinidad Map, U. S. Geological Survey, 7.5' x 7.5'. The jaspers may have originated in cherts of the Franciscan Series of Jurassic age. ...colorful, adv., Roy's Rock Shop, Lapidary Journal, v. 11, no. 5, p. 607.
2829Trublack, copyrighted trade name for dyed black, Brazilian onyx agate, adv., Adolph Meller Co., The Mineralogist, v. 14, no. 11, p. 525. The coloring process appears to be restricted to the surface of the slice; it may have been an electrochemical or photographic process; the pieces appear to have a small square spot where an electrode may have been attached.
2830Trummerachat (German), brecciated agate/amethyst vein material from Schlottwitz, Saxony, (Hintze, 1915, p. 1472, 1481) and Wendel, Saarland, Germany, Gaertner (1971, p. 24, 25).
2831Truncas Geodes, No Locality, (Mexico?), àcalcite and agate interior, adv., Gem Shop, Lapidary Journal, v. 46, no. 7, p. 174. May be a mis-spelling of Trancas Geode.
2832Tube Agate, Pabian and Zarins (1994, p. 15, fig. 25) suggested that a tube agate in the simplest case resembled a chemist=s test tube. They stated that a needle of some mineral such as goethite could serve as a nucleus about which banding would take place in a concentric pattern. They suggested that eye and tube agates had different origins and should not be confused with each other. Rubes may be small and several may be contained in an agate nodule or tubes may be large and singular. Cross (1996, p. 97) illustrated two examples that are about 0.25 m (10 in.) long and about 40 mm (1.5 in) long.
2833Tula Hill Fire Agate, Villela, San Luis Potosi, Mexico, a name applied by American collectors for fire agate in the above area by Jones (1962, p. 113), but a name which Miller & Olson (1966, p. 29) suggest is not used locally for this agate producing site and such reference causes confusion amongst the local populace.
2834Tuledad Agate, for Tuledad Canyon, Modoc County, California, flame colored to delicate green agate; varicolored agate, green, cream, white, green on cream, browns, red, etc., with the best grades resembling jade See Robertson, D., 1970, p. 737. Geographic Names Information System shows Tuled Canyon to be situated at about 41o 01' N and 102o 02' W, Lassen County, California, Little Hat Mountain and Boot Lake Maps, U.S. Geological Survey, 7.5' x 7.5'.
2835Tule Desert Exotic Jasper, Utah, no description adv., Alpine Gems & Minerals, Lapidary Journal, v. 34, no. 1, p. 178. The name Tule Desert does not appear in Geographic Names Information System.
2836Tullahoma Carnelian Agate, Tennessee, ...true gem red, adv., Willscraft, Lapidary Journal, v. 16, no. 11, p. 1012.
2837Tulsa Wood, Oklahoma, grainy petrified wood from the Tulsa area, not generally of high quality (Murphy, 1963, p. 114).
2838Tumbling Beans, Mexico, 5/8 minus, adv., Rocky Joes, Lapidary Journal, v. 18, no. 1, p. 172. Synonym of Bean Agate.
2839Tundra Agate, Alaska, black to dark brown. Schoonover (1964, P. 164) suggested this material may really be a chert and the presence of fossils supports this statement.
2840Tunnel Marsh, near Tarraleah, Tasmania, ProspecTas, the quarterly newsletter of Mineral Resources Tasmania, Issue 8, March, 1997 reported that the Mineral Resources Development Act of 1995 set aside areas for amateur collectors. This publication lists petrified wood, agate, and jasper as materials from this site. See also Bacon and Bottrill (1977, p. 12, 13).
2841Tunstella Stone, Texas, (an Agate?). Name appears in 1954 catalogue for Gem Exchange (Gem Village), Bayfield, Colorado p. 7 . This may be a mis-spelling of Turitella, as the above catalogue contains numerous errors in orthography, rkp.
2842Turitella Stone, Wyoming, synonym of Turritella agate, which see, term appeared in W. S. Lewis (1947b, p. 150)
2843Turetelli Agate (misspelling) see Turitella Agate, Wyoming, adv., Allan Branham, The Mineralogist, v. 14, no. 9, p. 469.
2844Turitilla, mis-spelling of Turritella appeared in adv., J. G. Atwood, The Mineralogist, v. 13, no. 5, p. 183.
2845Turnberry, Scotland, site in the Old Red Sandstone of early Devonian age that yeleded one of the agates used by Fallick et al (1985, p. 672-674) in oxygen isotope studies used to determine temperatures of agate formation.
2846Turritella agate, California?, probably from Wyoming, adv., Keweenaw Agate Shop, The Mineralogist, v. 14, no. 9, p. 471.
2847Turritella agate, Wyoming, dark brown to black agate with generally white shells of gastropod Goniobasis misidentified as Turitella, adv., see International Gem Corporation, Tynsky's Gem Shop, Rocks and Minerals, v. 37, no. 3,4, p. 219. adv., Tynsky Service, Earth Science Digest, 4, no. 1, p. 28. From south-central Wyoming, on the edges of Delaney Rim (Johnson, 1965, p. 89) about 15 miles southwest of Wamsutter. The term is also used for fossiliferous limestones found in Texas, and locally called Cornado Stone. Zeitner (1963, p. 131) suggested that the snail in this agate was actually of the genus Oxytrema. Zeitner did not suggest this agate be renamed and was probably correct in this decision as orthography is preserved. In 1964, Zeitner (p. 345) recognized these snails were of the genus Goniobasis, but suggested the name Turitella be retained, as it was well established. ...color illustration in adv., Harry Sering Co., Lapidary Journal, v. 32, no. 3, p. 678-679. Bushman (1981, p. 504-507) uses name correctly.
2848Turitella from Texas, Texas, no description adv., Clay Ledbetter, Stonecraft Lapidary Journal, v. 9, no. 1, p. 94.
2849Turritella stone (=Turritella) Agate, adv., Warner & Grieger, The Mineralogist, v. 5, no. 3, p. 11.
2850Turtle Mountains (agate, jasper), California, many sites around 114o 34' 30" W to 114o 47' 30" W, 34o 29" N, San Bernardino County, California, Snaggletooth, Savahia Peak, and Mohawk Springs Quadrangles, U. S. Geological Survey, 7.5 minute series (Topographic), and many prospects in T. 4 N. and T. 5 N., R. 20 E. and R. 21 E., San Bernardino County, California. Mitchell (1986, p. 33, 34). Strong (1966, p. 14-16, 1971, p. 68-70) recorded an Agate Hill in the Turtle Mountains, which name does not appear in Geographic Names Information System.

About the Agate Lexicon

The Agate Lexicon and glossary of amorphous and cryptocrystalline silica gems have been designed to be used in conjunction with the Agate Bibliography, which was compiled to be used by researchers, hobbyists, historians, lapidaries and other individuals which have an interest in these stones. Numerous localities are listed here but this does not imply that the sites are available for collectors or collecting. Many of the sites are historic, depleted, are on private property or are protected by legal leases or claims and some are now on protected sites such as parks, nature preserves, or historic areas. Wherever possible, stratigraphic details are listed, but the user must always refer back to the original citations. Map information has been derived from 7.5' x 7.5' topographic maps issued by the U.S. Geological Survey (USGS) and latitude and longitude have been derived mostly from Geographic Names Information System of the USGS.

Authors should not cite the Agate Bibliography or Agate Lexicon as a source in their published or unpublished works but should cite only those publications listed therein.

Named varieties of agates, jaspers, etc., have created special problems for both scientific researchers and historians. We have recognized at least two different usages of names. Some names appear to have geologic / historic validity, as they were described along with the lithology / geography of a region. Some names were introduced simply as trade names to boost sales of gem dealers. In the former case, the name will be followed by appropriate literary citation as to who first used the name and in what context. In the latter case, an advertisement (abbreviated adv.) is the first published record or public notice. We have tried to find the earliest citation in either case and the user should keep in mind that older citations unknown to us may exist. Advertisements are not cited to generate business but to simply give a historic source; many of the firms appearing in the citations are indeed no longer in existence.

Cited materials are generally only from accessible sources such as professional journals, magazines, hobbyist journals, open file reports of government agencies, newspapers, etc. Bulletins issued by local clubs and societies are generally not cited with the exception of those special publications that were actually made for public distribution.

Wherever possible, imagery of one or more specimens of named agate varieties, structures, patterns, etc. are provided. Images have been provided by several sources and are not to be utilized in other pages without the consent of the image owner.