| ID | Agate |
|---|---|
| 1155 | Galaxy Agate, Mexico, ...white "Sputniks" floating on white bands in light purple, adv., Jeweltrain, Lapidary Journal, v. 13, no. 5, p. 643. |
| 1156 | Galaxy Geodes, Chihuahua, Mexico, no description, adv., Gem Center USA, Lapidary Journal, v. 45, no. 1, p. 268. Cross (1996, p. 111, fig. 77e) recorded these geodes to have a brown-gray rhyolite shell and drusy quartz interior. |
| 1157 | Galeana Agate, Galeana? Chihuahua, Mexico. Source of name unknown. Specimens with this label have been observed in the collection of the late Lafayette Funk. The name Galeana does not appear in such standard references as Cross (1996) or in any so far observed geographic name data base for Chihuahua. A village called Galeana is situated in Nuevo Leon and the surrounding area contains Cenozoic volcanic and clastic rocks. This may have been the source for this agate. |
| 1158 | Gallatin Petrified Forest, see Field (1983, p. 1218-1223). |
| 1159 | Gallego Agate, Mexico, no description, adv., Southern Gems and Minerals, Lapidary Journal, v. 11, no. 5, p. 539 [earliest observed usage]; Paso Del Norte Minerals, Rocks and Minerals, v. 34, no. 11,12, p. 627. Cross (1996, p. 48) and personal communication (1995) suggested these were red to pink to gray, amygdaloidal agates that commonly had hollow centers and many prove to be iris agates. They have been produced from the Rancho El Agate Andesite from pits in the vicinity of 29o 49' 18" N and 106o 21' 04" W, on Rancho Gallego, southeast of Sueco, Chihuahua, Mexico. |
| 1160 | Gallegoes (=Gallego?) Agate, Mexico, misspelling. Adv., Paso del Norte Minerals, The Mineralogist, v. 28, no. 11,12, p. 199. |
| 1161 | Gallegos (=Gallego?). Gallego Ranch, Chihuahua, Mexico? This is a common mis-spelling of Gallego. The term Gallego was used without the finals by early authors (Sinkankas, 1959; Lyons and Young, 1961) and the preferred spelling is without the final s. |
| 1162 | Gallup Agate, New Mexico, fluorescent, Name appears in 1954 catalogue for Gem Exchange (Gem Village), Bayfield, Colorado, p. 6. |
| 1163 | Ganser bed nodules, California?, no further information, adv., Christie Conway, Inglewood, California. Check Spelling with ad here. |
| 1164 | Gary Jasper, no locality, ...gray, red, and green, adv., Ajax Minerals, Rock & Gem, v. 2, no. 5, p. 46. See Gary Green Jasper below. |
| 1165 | Gary Green Jasper, Oregon? ...greenish blue, ...earthy brownish greens, adv., Geodyssey Rock Shop, Lapidary Journal, v. 31, no. 1, p. 336. Called Cary Green Jasper by Sams (1977, p. 64, 66). It was presumably named after an individual by the name of Gary MacIntosh (Fraser & Fraser, 1990). |
| 1166 | Gaspe Agate, banded agate, for Gaspe' Peninsula, Quebec, Canada, see Gaspe Pebbles. |
| 1167 | Gaspe Pebbles, for Gaspe Peninsula, Quebec, Canada, pebbles of agate, red and yellow and green jasper derived from conglomerates of Gaspe Sandstones at Gaspe Bay (Honeyman, D., 1880, p. 136-138). |
| 1168 | Gem Hill Agate, California, ...iris agate, from 6 miles south of Mojave, Kern County, Chenard (1962, p. 106). Berkholz (1962, locality 1) stated the site yielded nodular agates with green surfaces and patterns similar to agates from Brazil. She also mentioned petrified wood and roots at that site. Geographic Names information System shows Gem Hill at 34o 55Æ 28ö N and 118o 13Æ 13ö W, Kern county, California, Soledad Mountain Map, U. S. Geological 7.5ö topographic. |
| 1169 | Gem Hill (Jasper), California, a site from which very colorful jasper has been collected (Lewis, 1942, p. 116) and which is is situated at 34o 55' 28" N and 118o 13' 13" W, Kern County, California, Soledad Mountain Quadrangle, U.S. Geological Survey, 7.5 minute series (Topographic). |
| 1170 | Gem Hollow, California, site mentioned by Strong (1971, p. 72) that yielded blue, lavender and pink agate. The name Gem Hollow does not appear in Geographic Names Information System. |
| 1171 | Gem Moss Jasper, no further information, adv., Keweenaw Agate Shop, The Mineralogist, v. 16, no. 1, p. 19. |
| 1172 | Georgia Agatized Coral, Georgia, ...bluish gray, adv., Aubrey Bottoms, Lapidary Journal, v. 17, no. 2, p. 305. |
| 1173 | Geyser Agate, Wyoming, ...with blue agate flakes, adv., Wyoming Rock Shop, Lapidary Journal, v. 15, no. 1, p. 209. |
| 1174 | Ghost Crystal, a term used by Kite (1959, p. 72-84) to describe quartz crystals in agate from Louisiana that are so tightly packed as not to undercut. |
| 1175 | Ghrysoprase, mispelling of chrysoprase?, adv., Francis Hoover, Lapidary Journal, v. 13, no. 5, p. 667. |
| 1176 | Gilson Created Opal, synthetic, manufactured product originating in France. ...color illustrations in adv., World Wide Gems, Lapidary Journal, v. 33, no. 9, p. 2329. |
| 1177 | Gingko Forest Petrified Wood, Washington, no description, adv., Mueller's, Lapidary Journal, v. 12, no. 4, p. 461. |
| 1178 | Gingko Petrified Forest State Park, Washington, see Glover (1949, p. 24, 25) and Selde (1979, p. 2190-2197).. Opalized woods of about same age as Saddle Mountain Wood. |
| 1179 | Gladstone, Tasmania, fossicking area around old tin mines where some jasper has been located. See also Bacon and Bottrill (1977, p. 34, 35). |
| 1180 | Glass Agate, not an agate; trade name often applied to glass with colored swirls, layers, and various inclusions. The term is often loosely applied to beads and to various dishware. See also agate ware. Fraser and Fraser (1988, p. 72) suggested the term is wrongly used for exceptionally clear obsidian or agate; but apparently glass cabochons with swirls and designs that are suggestive of patterns in agates ,... adv., Emix, Lapidary Journal, v. 25, no. 2, p. 359; Shipley (1971, p. 85) suggested that the term was applied to translucent or transparent chalcedony an erroneously used as a name for obsidian. |
| 1181 | Glenaroch Road, Rhodesia (Zimbabwe), agate locality listed by Zeitner (1968, p. 960-966). |
| 1182 | Glen Farg, Perthshire, Scotland, locality mentioned by Rodgers (1975, p. 87) and Macpherson (1989, p. 19) for agates from lavas of Old Red Sandstone of Early Devonian Age. |
| 1183 | Glory Blue Chalcedony, Montana, no description, name is used in U.S. Bureau of Mines directory of gemstone producers (Austin and Copeland, 1995, p. 30). |
| 1184 | Goffs, California (agate, jasper, opalite, petrified wood, palm wood), localities about 10-12 miles N of Goffs, California, San Bernardino County, Goffs, Signal Hill, and Hackberry Mountain Quadrangles, U. S. Geological Survey, 7.5 minute series (Topographic). Mitchell, 1986, p. 37-39....agate and opalite (Perry, 1961, p. 310). |
| 1185 | Goff's, a frequently seen misspelling of Goffs. |
| 1186 | Gold Basin (agate), California, for Gold Basin, 33o 09' 30" N and 114o 50' 40" W, Imperial County, California, material from outcrops in secs. 1, 2, 11, 12, T. 11 S., R. 20 E., and secs. 7, 8, 17, 18, T. 11 S., R. 21 E., Buzzard's Peak Quadrangle, U. S. Geological Survey, 7.5 minute series (Topographic). See Mitchell, 1986, p. 16, 17 |
| 1187 | Golden Agate, Utah, no description, ...adv., Alpine Gems & Minerals, Lapidary Journal, v. 34, no. 1, p. 178. |
| 1188 | Golden Bloom Agate, term used in Jackson (1992, p. 10) for goethite inclusions in agates found near Split Rock, Skagit County, Washington. |
| 1189 | Golden Fern Moss, locality not given, adv., George Curtis (The Agate Man), Earth Science Digest, v. 1, no. 11, p. 19. |
| 1190 | Golden Fern Moss Agate, no locality, no description, adv., George C. Curtis "The Agate Man", Lapidary Journal, v. 1, no. 4, p. 188. |
| 1191 | Golden Gate Jasper, for Golden Gate Bridge, San Francisco, California, may be synonym of Kinradite or Belvedere Jasper. Symons (1936, p. 216) stated that F. J. Sperisen had donated specimens that were excavated from the North pier of the Golden Gate Bridge, Marin county, to the California semi-precious gemstone exhibit at the Division of Mines, San Francisco. Symons further stated that it came in small dabs of red, blue, yellow, green and brown but most pieces were badly fractured and it provided only small cabochons. The Mineralogist, v. 25, no. 2, p. 74....colorful, solid, adv., Mel's Rock Shop, Lapidary Journal, v. 8, no. 3, p. 277. Rose Alene McArthur (personal communications, 1998) related that a Mr. Theo Steinhaur of San Francisco stated the jasper was discovered while construction crews were putting in pylons for the Golden Gate Bridge and that the material was promoted by a jeweler named Mirick (sic.). |
| 1192 | Golden Moss, Mexico?, adv., George Curtis (The Agate Man), Earth Science Digest, v. 1, no. 11, p. 19. |
| 1193 | Golden Moss Agate, Colorado, no description, Name appears in 1954 catalogue for Gem Exchange (Gem Village), Bayfield, Colorado, p. 4. |
| 1194 | Golden Moss Agate, Oregon, yellowish to brownish moss agate from Richardsons Ranch, Oregon, Hall (1975, p. 8-11). |
| 1195 | Golden Opalite, Australia, ...yellow opal with black dendrites, adv., Australian Exports, Lapidary Journal, v. 27, no. 10, p. 1515. |
| 1196 | Golden Pheasant (Agate?, Jasper), Swanson Ranch, Oregon, term used without description by Eaton (1988, p. 63-65). |
| 1197 | Golden Valley Flower Agate, San Bernardino County, California, name used by Berkholz (1962, p. 8, 9) and Strong (1971, p. 25) for transparent brown to beige agate with white, flower-like inclusions. The name Golden Valley does not appear in Geographic Names Information System. |
| 1198 | Goldfield Gem Claim, Esmeralda County, Nevada, site recorded by Strong (1971, p. 7) that produced agate, eye agate and plasma. The Goldfield Map, U. S. Geological Survey 7.5 minute series (topographic) shows several mines on that quadrangle but it is not presently known if any of these are the gem claims. |
| 1199 | Gold Lace Agate, Australia, no description, adv., Australian Exports, Rock & Gem, v. 4, no. 12, p. 26. |
| 1200 | Gold Lace Opalite, Australia, no description, adv., Kovac's Gems and Minerals, Lapidary Journal, v. 21, no. 9, p. 1142. |
| 1201 | Goldlace Opalite, Western Australia, a bright yellow, common opal with black or brown dendritic inclusions, described and illustrated in Perry & Perry (1967, p. 62, 63). |
| 1202 | Gold Plume Agate, Nova Scotia, ...color illustration in Person (1977, p.126-136). |
| 1203 | Gold Rush Wood, Chalk Bluffs area, California, refers to petrified wood that may have been in gangue from hydraulic gold mining operations. See Burns, 1976, p. 32-34. |
| 1204 | Gold Sagebrush Agate, Utah, no description adv., Alpine Gems & Minerals, Lapidary Journal, v. 34, no. 1, p. 178. |
| 1205 | Goldstrike Jasper, no locality, no description, adv., Alpine Gems & Minerals, Lapidary Journal, v. 34, no. 1, p. 178. |
| 1206 | Goldstrike mosaic jasper, ... no locality, no description, adv., Alpine Gems & Minerals, Lapidary Journal, v. 33, no. 1, p. 295. à..with pyrite, adv., Alpine Gems & Minerals, Lapidary Journal, v. 45, no. 1, p. 58. |
| 1207 | Goldum Agate, this term shows up as Rivera Lace (=Goldum Agate), Utah, no description, adv., Greenway Slabs & Cabs, Lapidary Journal, v. 30,no. 5, p. 1238. |
| 1208 | Golf Balls, Mexico, ...like Laguna, adv., Goodnow Gems, Lapidary Journal, v. 24, no. 11, p. 1433. |
| 1209 | Goniobasis Agate, Wyoming, (=Turitella Agate). Breithaupt, B. H., 1983. Rocks and Minerals, v. 58, no. 5, p. 247. |
| 1210 | Goodnoe Opal, Washington, no description, adv., Twin Junipers Rock Shop and Museum, Lapidary Journal, v. 15, no. 6, p. 681 or 687? |
| 1211 | Goodnow Agate, Mexico, adv., Goodnow Gems, Rocks and Minerals, v. 46, no. 2, p. 103. |
| 1212 | Goose Lake Thunder Eggs, California? adv., Robert J. Graham, The Mineralogist, v. 5, no. 3, p. 24. Geographic Names Information System lists 11 sites with the name Goose Lake. |
| 1213 | Gourdie, Scotland, historic locality in Perthshire that has payed agates from lavas of the Old Red Sandstone of Early Devonian Age. The site was first recorded by Heddle (1901, p. 76) who stated the exterior layers enveloped red natrolite. Rodgers (1975, p. 87) suggested few agates at this site which is also mentioned by Macpherson (1989, p. 19). |
| 1214 | Gowke, Rhodesia (Zimbabwe), collecting locality listed by Zeitner (1968, p. 960-966). |
| 1215 | Gracias Road, Guatemala, an opalized wood locality listed by Barbour and Barbour (1965, p. 1320-1326). |
| 1216 | Graham Pass Agate, California, sagenitic agate, for Graham Pass, 33o 27' 06" N and 115o 08' 02" W, Riverside County, California, Chuckwalla Spring Map, U. S. Geological Survey, 7.5' x 7.5'. See references (Perry, 1961?) and Johnson (1971, p. 6) |
| 1217 | Grand Canyon Agate, Arizona, no description, adv., South Bay Lapidary Supply, Lapidary Journal, v. 32, no. 7, p. 1598. |
| 1218 | Grand Marais Pebbles, Minnesota, the name appears to be a synonym of Lake Superior Agate, adv., The Gem Exchange, Hobbies, v. 43, no. 1, p. 110. |
| 1219 | Granger Agates, Wyoming, locality not given, adv., Tynsky Service, Rock Springs, Wyoming, Earth Science Digest, v. 4, no. 1, p. 28. The name is probably derived from Granger, Sweetwater County, Wyoming. Jackson (1973, p. 20-24) describes moss agates from Moss Agate Cut, 41o 24' 07" N and 110o 11' 50" W, Uinta County, Wyoming. There is also a Moss Agate Knoll situated nearby at 41o 33' 55" N and 110o 00' 31" W, Sweet Water County, Wyoming. Both sites are near Granger, Wyoming. |
| 1220 | Grape Agate, a term used to describe botryoidal clusters of chalcedony that superficially resemble bunches of grapes. Sometimes these are displayed as fossil grapes. Various Localities. |
| 1221 | Grape Agate, eastern Oregon. See McMullen, 1975, p. 18. |
| 1222 | Grape Agate, Utah?, adv., Hubert's Rock Shop, Earth Science Digest, v. 8, no. 1, p. 25. San Rafael Swell, Utah. Simpson (1975, p. 86, 87) described it as being bubble-like. |
| 1223 | Grape Agate, Utah, =Botryoidal Carnelian, adv., Smith's Agate Shop, The Mineralogist, v. 7, no. 1, p. 19. Botryoidal, usually purple chalcedony, Anon, The Mineralogist, v. 4, no. 5, p. 24. |
| 1224 | Grape Rock =Grape Agate, botryoidal, usually purple chalcedony, Anon, The Mineralogist, v. 4, no. 5, p. 24. |
| 1225 | Graphic Chalcedony, California, ...white to creamy with hematite forming graphic markings, from near Barstow, ----------County, Sperisen (1938, p. 47). |
| 1226 | Grass Mountain Wood, ?Oregon, no description, adv., Equipment Fund, Walla Walla College, Lapidary Journal, v. 28, no. 8, p.1224. |
| 1227 | Grassy Mountain Petrified Wood, no locality (Washington? Oregon?), no description, adv., Prof's Rock Shop, Lapidary Journal, v. 32, no. 2, p.519. Grass Mountain and Grassy Mountain appear to have been used interchangeably and the name appears in both Oregon and Washington. Insufficient data is at hand to determine the source at this time. |
| 1228 | Graveyard Plume Agate, see Graveyard Point Plume Agate. |
| 1229 | Graveyard Point Agate, see Graveyard Point Plume Agate. |
| 1230 | Graveyard Point ôFlower Agateö, Idaho, for Graveyard Point, E ╜ NW ╝, sec. 26, T. 3 N., R. 6 W., Owyhee County, Idaho. The term was first used by (Anonymous [H. C. Dake?] 1944, p. 50 for agates from this area and ôflowerö agate has one word priority over ôplumeö so the proper terminology should be Graveyard Point Flower Agate. |
| 1231 | Graveyard Point (plume) Agate, Idaho, for Graveyard Point, E 1/2, NW 1/4, sec. 26, T. 3 N., R. 6 W., Owyhee County, Idaho, Graveyard Point Quadrangle, Oregon-Idaho, 1967, U. S. Geological Survey, 7.5 Minute Series (Topographic). See also Major, D., 1952. The convention of the Northwest Federation of Mineralogical Societies at Caldwell, Idaho, August 23, 24, 25, 1952, Earth Science Digest, v. 6, no. 3, p. 37; Hanson (1956, p. 58-61). Listed as "Graveyard Point" plume, adv., Bensel's Rockery, Lapidary Journal, v. 13, no. 5, p. 694....plume agate with red, yellow, brown, adv., Wright's Rock Shop, Lapidary Journal, v.31, no. 2, p. 594. . See also Rodgers, 1976, p. 116-128). |
| 1232 | Gray Billy, a term used by Australian miners and geologists to describe silcrete (silicified siltstone) that is often associated with opal and agate. See Chalmers (1968). |
| 1233 | Greasy Cove Agate, Alabama, this appears to be a locally used name that came via correspondence with Bill Reynolds (January 21, 1998). See Lapidary Journal, April 1996.xxxxx |
| 1234 | Great Sand Bay, Agate producing area on the Keweenaw Peninsula, Michigan, referred to in a Web Page, Hunting Agate in the Keweenaw at: http://www.portup.com/traveler/nature/agates.html |
| 1235 | Green and white banded agate, dyed agate, probably from Brazil or Uruguay. (see gem course materials) |
| 1236 | Green Antelope Moss, Antelope, Oregon, adv., Smith's Agate Shop, The Mineralogist, v. 4, no. 4, p. 29. |
| 1237 | Green Ash Hills, California, agate producing sites recorded by Strong (1965, p. 18-20). The name Green Ash Hills does not appear in Geographic Names Information System. |
| 1238 | Greenbrier Agate, West Virginia, see Hills (1980, p. 742-745). |
| 1239 | Green Ash Hills, California, wood, agate and jasper site recorded by Strong (1971, p. 37). The name Green Ash Hills does not appear in Geographic Names Information System. |
| 1240 | Green Chalcedony, Rhodesia, chrome green swirls and patterns, adv., Parser, Lapidary Journal, v. 38, no. 5, p. 657. |
| 1241 | Green Chalcedony with dendrites, Brazil, adv., Murray American Corporation, Rocks and Minerals, v. 47, no. 7,8, p. 455; Lapidary Journal, v. 26, no. 12, p. 1710. |
| 1242 | Green Chrome Chalcedony, Mtoro, Zimbabwe, Africa, also known by local name Mtorolite, adv., New Era Gems, Lapidary Journal, v. 45, no. 2, p. 135. |
| 1243 | Greenhorn, historic locality in Oregon, reported by Kathan (1951, p. 40-48). |
| 1244 | Green jelly (opal) with fire, Australia, adv., Crete Lapidary & Supply Co., Earth Science, v. 16, no. 6, p. 299. |
| 1245 | Greenlace Agate, Nevada, black in white, red in white, pictures, adv., R. O. Houghtoling, Lapidary Journal, v. 3, no. 3, p. 229. |
| 1246 | Green Meadows Moss Agate, no locality, no description, adv., Colorado Lapidary Supply, Rock & Gem, v. 4, no. 3, p. 13. |
| 1247 | Green Moss, Mexico, Mexico, adv., B &H Rock Shop, Earth Science, v. 13, no. 6, p. 240. |
| 1248 | Green Moss (see India Moss) Adv. Southern Gem & Mineral Company, 5241 Montoya Rd., El Paso, TX |
| 1249 | Green Mountain Jassper, Vermont, bright red, adv., Minerals and Gems, The Mineralogist, v. 25, no. 12, p. 447. |
| 1250 | Greenspring Mountain, Oregon, collecting locality listed by Kathan (1951, p. 40-48). The name Greenspring Mountain does not appear in Geographic Names Information System. |
| 1251 | Green Squaw Jasper, Arizona, See Ransom, 1955, Southwest gem trails and the Green Squaw Jasper, the Mineralogist, v. 37, no. 4, p. 147-151. Type locality and description given there. |
| 1252 | Greentree Agate, see Green Tree Agate. Greentree is shown as a single word in adv., Greenway Slabs & Cabs, Lapidary Journal, v. 30, no. 5, p. 1238. |
| 1253 | Green Tree Agate, India, no description, adv., Aleta's Rock Shop, Rock & Gem, v. 4, no. 12, p. 77. |
| 1254 | Gregoria Agate, Mexico, adv., LoMa Lapidary, Lapidary Journal, v. 18, no. 10, p. 1132. Amygdaloidal Agates named for Rancho Gregoria, between Ojo De Laguna and Estacion Moctezuma, Chihuahua, Mexico. They are mined from claims in the vicinity of 29o 42' 04" N and 106o 15' 58" W, from units mapped as Rancho El Agate Andesite (Cross, 1996, p. 48, 49, Table 1). |
| 1255 | Gregorio Agate, Mexico, misspelling xx of Gregoria, ...Laguna type, P.O. Box 9863, El Paso, Texas adv., LoMa Lapidary, Lapidary Journal, v. 16, no. 10, p. 955. |
| 1256 | Groppendorf, Germany, Gotze, Plotze, Fuchs and Habermann (1999, p. 152, 153) suggested that agates from this site formed in a malaphyre and examined them by electron paramagnetic resonance, cathodoluminescence and trace element content. |
| 1257 | Grouse Creek Nodules, Idaho, no description, the term appears in an adv. by Garden State Minerals, New Jersey that refers to these as "Idaho Potato Nodules"; Steweart's Gem Shop, used Grouse Creek Nodules in adv., Earth Science, v. 9, no. 1, p. 25. although their advertizement in Lapidary Journal, v. 3, no. 5, p. 358 suggested "Idaho Potato Agates" were from Grouse Creek and Hog Creek. There are 41 entries for Grouse Creek, Idaho, in Geographic Names Information System and the correct entry has not been determined. |
| 1258 | Guadalajara Fiesta Jasper, Guadalajara, Mexico, ...reds, pinks, adv., Riviera Lapidary Center, Rock & Gem, v. 7, no. 8, p. 85.;...fine gem red, green/tan, adv., Lapidary Journal, v.30, no. 10, p. 2390. |
| 1259 | Guadalajara Pink Jasper, Mexico?, no description, adv., Riviera Lapidary Center, Lapidary Journal, v. 40, no. 7, p. 73. |
| 1260 | Guadalupe Canyon Agate, Arizona, no description, Getsinger (1961, p. 316), probably for Guadalupe Canyon that extends from 31o 20' 35" N to 31o 27' 56" N and 109o 02' 29" W and 109o 03' 46" W, Cochise County, Arizona, and Hidalgo County, New Mexico, Guadalupe Canyon and Guadalupe Springs Maps, U.S. Geological Survey 7.5' x 7.5'. |
| 1261 | Guadalupe Jasper, California, an orbicular jasper from near Morgan Hill? reported by Ferguson (1977, p. 1794-1800). It is illustrated and may be similar to California Poppy Jasper. Neavitt (1968, p. 1227) illustrates a bowl called Guadalupe Jasper but which is similar to California Poppy Jasper. |
| 1262 | Guadalupe Jasper-Agate, no locality, no description, adv., The Butterfields, Lapidary Journal, v. 10, no. 2, p. 188. |
| 1263 | Guadalupe poppy jasper, a popular orbicular jasper from near the Guadalupe Reservoir, Santa Clara County, California. The U. S. Geological Survey geographic names database shows Guadalupe Reservoir is at 37o 11' 57" N and 121o 52' 40" W, and that Morgan Hill, the site of poppy jasper is at 37o 07' 50" N and 121o 39' 12" W, Santa Clara County, California. |
| 1264 | Guatemala Agate, adv., Crete Lapidary, Rocks and Minerals, v. 39, no. 9,10, p. 504-505. |
| 1265 | Guernsey Lake Agate, Wyoming, Guernsey Lake and surrounding area, Wyoming. Banded agate from chert nodules found in middle and late Pennsylvanian (Desmoinesian, Missourian) strata of Wendover, Meek, and Hayden Groups. See Condra, Reed, & Scherer, 1950, and Harper, J., 1960. See also Steege (1965, p. 7). Hausel (1986, p. 46) stated that these agates are found in seams in the Guernsey Formation exposed near Hartville, Wyoming. These agates are the parent material of fortification agates found in the Chadron Formation of the White River Group of Oligocene age in the Niobrara and White River Drainages of northeastern Wyoming, northwestern Nebraska, and parts of southwestern South Dakota. In the former areas, these agates are called Fortification agates, and in the latter, Fairburn Agates. The source for the agates from Fairburn, South Dakota, however, appears to have been the Black Hills. |
| 1266 | Gulch Agate, Utah, see Mansell, 1972, p. 890-902. |
| 1267 | Gull River Chert, Ontario, |
| 1268 | Gwelo, Rhodesia (Zimbabwe), collecting locality listed by Zeitner (1968, p. 960-966). |
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.