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1003 Eagle Agate, Mexico? no further information, Merle's Rock Box, , The Mineralogist, v. 26, no. 4,5, p. 137. Zeitner (1971, p. 4-22) listed Eagle, New Mexico, as a well known agate collecting locality.
1004 Eagle Crags, California, blue, sagenitic, and moss agate from historic locality in the vicinity of 35o 23' 58" N and 117o 03' 38" W, San Bernardino County, California, Eagle Crags Map, U.S. Geological Survey, 7.5' x 7.5', and now on a military reservation. See Ransom (1955, p. 70) and Perry (1961, p. 309, 310).
1005 Eagle, New Mexico, site listed by Zeitner (1971, p. 4-22).
1006 Eagle Peak, California, site recorded by Strong (1971, p. 28) that produced salmon, black and white agate. StrongÆs site is supposedly in Inyo County, but Geographic Names Information System does not show an Eagle Peak in Inyo County but does list it in the general vicinity in Kern County. No further details available.
1007 Eagle Point agate, for Eagle Point, Oregon, 42o 28' 16" N and 122o 47' 23" W, about 10 mi North of Medford, Jackson County, Oregon, Eagle Point Map, U.S. Geological Survey, 7.5' x 7.5', ...generally carnelian and moss agates, The Mineralogist, v. 21, no. 12, p. 462. Johnson (1971, p. 60) recorded moss and dendritic agates from this area.
1008 Eagle Rock Agate, Oregon, for Eagle Rock, 44o 11' 49" N and 120o 39' 02" W, Crook county, Oregon, Eagle Rock Quadrangle, U. S. Geological Survey, 7.5 Minute Series (Topographic). (cf. Eagle Rock Plume Agate), blue to pink with black base. Adv., Herbert Wm. Lawson, Box M, Terrebonne, Oregon, the Mineralogist, v. 22, no. 4, p. 188; Oregon, no description, adv., the Keller's, Lapidary Journal, v. 11, no. 1, p. 141. to brown to traces of black (Browning, 1961, p. 240). . See also Rodgers, 1976, p. 116-128).
1009 Eagle Rock Black Plume Agate, Oregon, ...graceful black plumes. adv., Herbert Wm. Lawson, Lapidary Journal, v. 3, no. 6, p. 464
1010 Eagle Rock Plume Agate, Oregon, for Eagle Rock, for Eagle Rock, 44o 11' 49" N and 120o 39' 02" W, Crook county, Oregon, Eagle Rock Quadrangle, U. S. Geological Survey, 7.5 Minute Series (Topographic), near Prinveille, Oregon. Kathan (1951, p. 40-48) used the term Angel Wing to describe this agate but Birdwell, (1959, p. 138-139) used the geographic term Eagle Rock and described them as black, and red plumes in gray matrix. Adv., Frances E. Ames, The Mineralogist, v. 17, no. 5, p. 244. adv., Herbert Wm. Lawson, The Mineralogist, v. 17, no. 11, p. 537; Lapidary Journal, v. 1, no. 4, p. 214. Illustrated, Novinger (1969, p. 1530-1536).
1011 Eagle Stone, Morse, 1796, American Geographer. In Oxford English Dictionary, Eagle Stones often include various kinds of fossils, agates, etc. There are no further details on this usage.
1012 Eagle Valley Ranch Agate, Oregon, for Eagle Valley Ranch (=old Palmer Place), near Antelope, Central Oregon. See Broughton, 1975 (p. 81-84) who stated these were thunder egg agates from decomposed rhyolites; some were reported to be small enhydros.
1013 Earp Badlands, California, jasper and jasp-agate locality recorded by Strong (1971, p. 70, 71). Earp Badlands does not appear in Geographic Names Information System but the site is probably near Earp, San Bernardino County, California.
1014 East Balgay, Scotland, historic locality in Angusshire (Rodgers (1975, p. 84; Macpherson, 1989, p. 19) that was earlier recorded by Heddle (1901, p. 76) as being in Forafshire. The agates are from lavas in the lower Old Red Sandstone of Early Devonian Age.
1015 Eastern Oregon Moss Agate (New Locality), Oregon, no description, adv., Fernwood Agate Shop, Oregon, Lapidary Journal, v. 8, no. 4, p. 369.
1016 East Idaho Agate, Idaho, black, blue, amber, wood, fluorescent, tube, adv., M. W. Johnson & Associates, Lapidary Journal, v. 25, no. 4, p. 644.
1017 East Slope Agate, Oregon? adv., Cascade Lapidary, Earth Science, v. 28, no. 3, p. 161. and gold, adv., Lapidary Journal, v. 28, no. 11, p. 1751.
1018 Eden Valley Wood, southwestern Wyoming, agatized wood from the Green River Formation of Eocene Age, includes often complete limb sections coated with various colors of opaque agate showing structures as knots, cracks, branches, burrows, and grain; often algae coated on outside. See Dickerson and Dickerson (1972, p. 1979-1080) and Zeitner (1967, p. 338-345).
1019 Egyptian Agate, a term used by Abbott (1887, p. 86) to describe jaspers that have colored bands that are not caused by changes in substance or structure, but due to are due to color lines or zones of decomposition. The term Egyptian Jasper was used previously by Phillips (1844, p. 12, 13) and has priority over Abbotts=s usage.
1020 Egyptian Banded Jasper, this is apparently the same material as Egyptian Agate, which see.
1021 Egyptian jasper, nodular jasper that is dark brown on the exterior and cream, lighter brown, and black on the interior, and is found east of Cairo to the Red Sea according to Phillips (1844, p. 12, 13). See also Egyptian (picture) Jasper. Foord (1870, p. 66) reported that in Europe, agates from Egypt had gained great popularity and tourists sought them; to meet the demand, agates from Rio de la Plata, Brazil, were fraudulently sold as agates from Egypt. Foord also stated that piece with the image of Chaucer was exhibited at the British Museum. Chandler (1943, p. 169) used the term generically for materials from Northern California.
1022 Egyptian (picture) Jasper. Egypt, Cairo Area, Anon,1945, Rocks and Minerals, v. 20, no. 6, p. 262-263. Claude Barlow Collection. See also Chandler (1943, p. 169).
1023 Egyptian Pebble, Another term for Egyptian jasper as used by Phillips (1844, p. 12, 13)
1024 Egyptian Sahara Jasper, Egypt? banded jasper, adv., Dr. C. H. Barlow, Lapidary Journal, Annual Rock Hound Buyer's Guide, 1956, p. 129
1025 Elephant Butte, New Mexico, agate and jasper collecting locality listed by Zeitner (1968, p. 1212-1226, 1230). Geographic Names Information System lists Elephant Buttes in Hidalgo and Sierra counties, New Mexico. Each is situated in areas that have produced agate.
1026 Ellensburg Blue agate, for Ellensburg, Washington. Type Locality Red Top Mountain, Kittitas County, Washington. Advertisement, King SI Agate Shop, The Mineralogist, v. 20, no. 5, p. 218; Harvey Lap Shop, Lapidary Journal, v. 12, no. 1, p. 197. The earliest usage of the name appears to have been Dake (1941, p. 49, 50) who (1950, p. 61) suggested that none were found in place. This material was known as early as 1922, and a 20 x 10 x 6 mm Cabochon (no. 1526, cut from specimen no. 87414) is in the collections of the U. S. National Museum, (Merrill, Moody, and Wherry, 1922, p. 122). See also Thomson, 1963. Zeitner (1964, p. 348) stated that Red Top Mountain and Crystal Mountain, near Cle Elum, Kittitas County, were the only two sources of Ellensburg Blue Agate, but Glover (1949, p. 24, 25) listed five localities: Virden, Liberty, Roundtop---Cle Elum Lake, Squaw Creek, and Ellesnburg as productive sites. Glover further stated that the Red Top site produced from the Teanaway Basalt and the Liberty se payed from the Yakima Basalt, and that the Red Top site yielded thunder eggs from rhyolite. Nuckles (1984, p. 948-952) recorded a very large specimen from the above area.
1027 Ellensburg Flats, Washington? adv., Consolidated Mines, Rocks and Minerals, v. 43, no. 4, p. 275
1028 El Marmol, Baja California, Mexico, locality containing colorless to blue gray agate, some with black moss by Miller and Olson (1967, p. 1208).
1029 Embargo Agate, Colorado, for the site of Embargo, 37o 48' 22" N and 106o 31' 16" W, Sagauche County, Colorado, Pine Cone Know Map (7.5' x 7.5') or nearby Embargo Creek, South Fork East Map (7.5' x 7.5'), Sagauche County, Colorado. The name Embargo has been observed on labels in displays of dealers and exhibitors, but the material is probably the same as Del Norte Plume Agate.
1030 Emerald Green Agate, Mexico, nickel stained vein between two of white... adv., Jeweltrain, Lapidary Journal, v. 13, no. 6, p. 779.
1031 Emperor Agate, India, no description, adv., Astro Minerals, Ltd., Lapidary Journal, v. 19, no. 12, p[. 1326.
1032 Enhydro, a hollow agate nodule with a partially water filled cavity; the water can be seen through polished surfaces and heard when the nodule is shaken (Bauer, 1896, p. 508).
1033 Enhydros, Oregon, Brazil, Victoria, Australia, essentially water bubble agates. Ulrich (1866 {1867], p. 71), Selwyn et al (1868, p. 85), Smyth (1869, p. 252, 253), Foord (1870 - 2 [1874], p. 71 - 76), Dunn (1871 [1874], p. 32 - 35; 1913), Rath (1877, p. 63-80), Liversidge (1892, p. 33-36) used the term Enhydros (cf. enhydro, above) and recorded these stones from near Beechworth, Victoria, Australia. Cooksey (1895, p. 92 - 94) provided subjective studies. adv., Lapidary Journal, v. 15, no. 4, p. 476. Dake (1950, p. 60) also used this term for material from Oregon.
1034 Enkledoorn Agate, Rhodesia (Zimbabwe), blue and lilac plus white, Zeitner (1968, p. 960-966).
1035 Escadillo Agate, alternate spelling of Escudillo Agate. Bluish, translucent, clear or banded...adv., Sequoia Gem and Mineral Shop, 321 West Tulare Avenue, Visalia, California, Lapidary Journal, v. 2, no. 4, p. 275. The above advertizement suggests this agate is highly useable for utility items such as handles for eating and serving utensils. See also Anderson, J. W., (1949, p. 166). Geographic Names Information System lists only the spelling Escudilla.
1036 Escalante Agate, Utah, see Mansell, (1972, p. 890-902) and Simpson (1975, p. 74, 75).
1037 Escalante Agate, Mexico, descriptive, this term was suggested, with reservations, by Fraser and Fraser (1988, p. 72) but the name was not used by Cross (1996) in his descriptions of agates from Mexico. Escalante Agate Co., The Mineralogist, v. 12, no. 8, p. 254.
1038 Escalante Gulch, Utah, see Mansell (1972, p. 890-902).
1039 Escalante Wood, Utah, see Simpson (1975, p. 74, 75).
1040 Escudilla Agate, a misspelled variation of Escudillo, which see. Dimick (1963, p. 161-163) used the term Escudillo Agate although the U.S. Geological Survey Geographic data base shows Escadilla Mountain at 33o 55' 00" N and 109o 06' 36" W, Escadillo Mountain Quadrangle, Apache County, Arizona, and at 33o 51' 20" N and 109o 06' 51" W, Luna Lake Quadrangle, Apache County, Arizona, and Catron County, New Mexico.
1041 Escudillo Agate, New Mexico, Arizona, blue, gray, black, some carnelian, mostly banded agate, named for Escudilla Mountains, Dimick (1963, p. 161-163). Geographic Names Information System shows only the spelling Escudilla.
1042 Espina Agate, Sonora, Mexico, according to Cross (1996, p. 57) a synonym of Agua Prieta Agate.
1043 Espomoso, Minas Gerais, Brazil, spelling used by Wiersma (1996, p. 673). Probably the same as Espumoso Agate as used by Mattos (1974, p. 5).
1044 Espumoso Agate, Brazil, Rio Grande do Sul, Mattos (1974, p. 5).
1045 Ethie House (see Near Ethie House)
1046 Eucha Chert, Oklahoma, a name that is used locally by lapidaries and collectors in northeastern Oklahoma. Generally a white, gray and yellowish, banded chert that formed in yet to be determined sedimentary rocks that are exposed in the vicinity of Spavinaw Reservoir and the village of Eucha, 36o 23' 31" N and 94o 52' 58" W, Delaware County, Oklahoma, Choleta Map, U. S. Geological Survey, 7.5' x 7.5'. This material appears to be the same as Spavinaw Chert which see.
1047 Eureka Agate, Utah, for area around Pinon Canyon, near Eureka, 39o 57' 15" N and 112o 07' 10" W, Juab County Utah, generally red and yellow agate (Simpson, 1975, p. 8, 9). Hunter (1976, p. 1084-1089) called this material a jasper and referred to the site as Pinion's Peak (sic), a name that does not appear in Geographic Names Information System.
1048 Evergreen jasper, Minnesota, collector's term for jasper found in a large deposit in the Vermillion Range, northeast of Mesabi, and also in the vicinity of Ely, Minnesota described as "deep forest green". Zeitner (1964, p. 996) stated that it was originally discovered near Winton, Minnesota.
1049 Evergreen Jaspilite, Minnesota, this is probably the same material as Evergreen Jasper, and Zeitner (1963, p. 140) used this term for similar material from Minnesota; we do not know which term has precedence.
1050 Evil Eye Agate, Mexico, deep purple and white eyes, adv., Jeweltrain, Lapidary Journal, v. 13, no. 5, p. 643.
1051 Eye agate, an agate with concentric bands in a hemispherical spherulite, usually near the surface of a nodule (Pabian & Zarins, 1994, p. 21). Bauer (1896, p. 512) suggested that an eye effect can be produced by a sharp blow with a steel point on the flat surface of a slab.
1052 Eyed agate, Jackson [not dated, and cited in Foord (1870, p. 64)]: Asome agates have been formed by a bundle of cylinders enveloped in a siliceous paste, the cylinders themselves being formed of siliceous accumulation. When such an agate is cut perpendicular, it exhibits a multitude of circular figures bearing some resemblance to the iris and pupil of they eye---whence this kind is called eyed agate.@ Jackson=s description is that of what is now called tube agate. Heddle (1901, p. 69, figs. 19-21) used the term to describe hemispherically arranged spherulites (see Eye Agate) and the specimen from Scurdie Ness, Scotland, shown in the his drawing is illustrated in color by Macpherson (1989, p. 65), who used the term Eye Agate.

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.