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2288 Quarai Agate, for Quarai River, along Brazil-Uruguay border in southwestern Rio Grande do Sul, Brazil, Mattos (1975, p. 5).
2289 Quarry Cove, site in Cady Mountains, San Bernardino County, California, that produced jasp-agate, lace agate, and agate nodules and was recorded by Strong (1971, p. 54, 55). The name Quarry Cove appears in Geographic Names Information system but for a site in San Luis Obispo County which is distant from the site described by Strong.
2290 Quartzine, a fibrous chalcedony characterized by febers having a positive crystallographic orientation; that is, the fibers are parallel to the c-axes of the crystals. See Michel-Levy and Munier-Chalmas (1890, 1892).
2291 Queensland Agate, Agate Creek, Queensland, Australia. Highly colorful amygdaloidal agates that formed in the Agate Creek Volcanics of Permian age that are exposed on Agate Creek about 11 miles northwest of Percyville. These rocks were first described by Cameron (1900) and Hill and Denmead (1960) stated that there additional exposures of them 8.5 miles north of Gilberton Station. Ridgway (1945, p. 299, 300) described mining of vein agate from this area and he stated that the material was used in war time to make precision bearings for military purposes. Term appears in an advertizement by Stones and Findings of Australia, Pty., Limited, Lapidary Journal, v. 21, no. 1, p. 33.
2292 Queensland Boulder Opal, Queensland, Australia, Perry (1967, p. 52, 53) listed several localities and provided colored illustrations. Term appeared in adv., L. Backus Lapidary, Rocks and Minerals, v. 48, no. 1, p. 21.
2293 Queensland Petrified Wood, Queensland, Australia?, no description, adv., Riviera Lapidary Center, v. 38, no. 11, p. 1448.
2294 Queenstone, Idaho?, adv., Steweart's Gem Shop, Earth Science, v. 9, no. 1, p. 25; a synonym of Succor Creek Picture Rock, adv., Walla Walla College Equipment Fund. Blue, yellow, brown, green, pink jasper from rhyolites in low foothills east of U. S. Highway 95, in secs. 2, 3, 4, 10, 11, T. 1 N., R. 4 W., about 10 miles south to southeast of Marsing, Owyhee County, Idaho. Opalene Gulch Quadrangle, U. S. Geological Survey, 7.5 Minute Series (Topographic), photo-revised, 1971. See Beckwith, 1972, p. 38, 112, 113. ...Idaho, variegated opalite, Name appears in 1954 catalogue for Gem Exchange (Gem Village), Bayfield, Colorado, p. 4.
2295 Queretaro Opal, Mexico, cherry and fire opal, adv., Prairie Gems and Rock Shop, Lapidary Journal, v. 16, no. 1, p. 63.
2296 Quetzalcoatl Agate, Mexico?, no description, adv., the Cole's, Rocks and Minerals, v. 38, no. 7,8, p. 433; Anderson's Rock Shop, Lapidary Journal, v. 19, no. 1, p. 165.
2297 Quinn River Agate, Nevada, no description, adv., Silver 'N' Stones, Lapidary Journal, v. 13, no. 6, p. 826. This is probably the same material as Quinn River Amethyst Sage Agate. Boyd Compton (personal communication, 1998) suggested the material came from outcrops along the Quinn River near the Winnemucca - Denio, Nevada areas from privately operated claims.

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.