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3024Yachats Beach Agate, Oregon, for agates from gravels of Holocene and Recent ages along beaches near Yachats, 44o 18' 41" N and 124o 06' 13" W, Lincoln County, Oregon, Yachats Map, U. S. Geological Survey, 7.5' x 7.5'. See Birdwell, 1959. Outstanding agates of Oregon. Earth Science, v. 12, no. 4, p. 138-139.
3025Yalokomite (an agate?), no locality, no description, adv., Ira Wallace, Lapidary Journal, v. 17, no. 8, p. 826.
3026Yellow Cat Flat, Utah, site mentioned by Simpson (1975, p. 84, 85) and shown at 38o 50' 15" W and 109o 35' 00" W, Grand County, Utah, in the U.S. Geological Survey geographic names database.
3027Yellow Cat Redwood, Utah, local name?, Daniels (1998) illustrated examples of red limb casts with no trace of wood structure from Yellow Cat Flat above. See also Dayvault (2000, p. 258-267).
3028Yellow Hill Agate, Washington, a reddish agate, named for Yellow Hill, 47o 19' 35" N and 120o 59' 27" W, Kittitas County, Washington. See Anon. (1965, p. 608).
3029Yellow inlay jasper, Utah, adv., Alpine Gems & Minerals, Lapidary Journal, v. 33, no. 1, p. 295.
3030Yellow-Jackets, a thunder egg from the Ochoco Mountains, Oregon, no description, Rodgers (1971, p. 588-591).
3031Yellow Moss, Oregon, no description, adv., Central Oregon Gem Supply, Earth Science, v. 13, no. 2, p. 73.
3032Yellow Petrified Wood, South Dakota, pink, tan, soft brown, adv., Nonneman's, Lapidary Journal, v. 4, no. 1, p. 55.
3033Yellow Point Limbs, source unknown, adv., Tynsky's Gem Shop, Rocks and Minerals, v. 43, no. 2, p. 158.
3034Yellow Skin Agate, India, no description, adv., Stone Age Industries, Lapidary Journal, v. 42, no. 10, p. 116.
3035Yellowstone Agate, synonym of Montana Agate, Yellowstone River, Montana. Private Publication, undated, West Yellowstone Agate Shop, Box 506, West Yellowstone, Montana, leaflet, 2 pages, front and back.
3036Yellowstone River Plume Agate, Yellowstone River, Montana. Found along 10 mile strip on river, non in situ. See Kehoe, J. J., Yellowstone River Plume Agate, The Mineralogist, v. 14, no. 12, p. 664, 668.
3037Yellowstone Valley Agate, Montana, no description, adv., Headwaters Rock Shop, A. Dale Clark, Lapidary Journal, v. 12, no. 4, p. 558. (=Montana Agate?) rkp Yellowstone Valley Montana Agate, Montana, no description, adv., Paul Fry, Lapidary Journal, v. 5, no. 2, p. 164.
3038Yellow Tree Agate, Wyoming, term used by Spendlove (1994b, p. 60-62) for a dendritic agate from Wyoming.
3039Yemeni Agate, for Yemen on the Indian Ocean on the southern coast of the Arabian Peninsula. Historic source for agates that have been described as early as the 10th Century C.E. The agates were poetically described in a verse of Muallaqa of Imru al Qais that was translated by Arberry. Source: General People's Congress of Yemen;
3040Yemeni Jaz, Yemen, Arabian Peninsula, a black and white layered agate. See Yemeni Agate.
3041Yermo (agate, palm root), California, for outcrops near Yermo,in secs. 22, 23, 24, 25, 26, T. 10 N., R. 2 E., San Bernardino County, California, Harvard Hill Quadrangle, U. S. Geological Survey, 7.5 minute series (Topographic).
3042Yermo MP-110, California, no description, adv., Charles Gem Center, Lapidary Journal, v. 24, no. 9, p. 1246.
3043Yermo Pastelite, California, no description, adv., Christie Conway, California, The Mineralogist, v. 17, no. 10, p. 473.
3044Youngite, Wyoming, a local name applied to mottled pink, white and gray agate that has been described as a mixture of drusy quartz and banded agate covering yellow and pink breccia, and is found in caves formed in rocks of Mississippian age near Guernsey and Glendo. See Steege (1965, p. 7) and Anstey (1961, p. 5, 6). ...a nice green moss was incorrectly used to describe Youngite in adv., Weidinger, Inc., Lapidary Journal, v. 15, no. 5, p. 499. Hausel (1996, p. 49) suggested that youngite is a re-healed limestone breccia. àthe rock consists of pink- to cream-colored breccial clasts of Guernsey Limestone (Mississippian), re-healed, or cemented by light-grey to grayish blue, banded drusy quartz. The drusy quartz fills fractures in the breccia completely encasing the limestone clasts.
3045Youngite, Guernsey, Wyoming, no description, adv., Dullas' Mineral and Lapidary Supply Co., Earth Science, v. 17, no. 6, p. 277.
3046Yowah Nuts, Australia, ...ironstone (goethite?) concretions with solid opal kernels, adv., Austrex Gems Pty., Lapidary Journal, v. 27, no. 3, p. 467.
3047Yowah Opal, Queensland, Australia, a kind of opal found in concretions locally referred to as "Yowah Nuts," boulders which may have opal interiors, Schoonover (1972, p. 632).
3048Yuha Basin (chalcedony, jasper, agate), California, for Yuha Basin in approximately secs. 32, 33, 34, T. 16 S., R. 11 E., Imperial County, California, Yuha Basin Quadrangle, U. S. Geological Survey, 7.5 minute series (Topographic).
3049Yuma Petrified Hardwood, Arizona?, no description, adv., Fosters, Lapidary Journal, v. 13, no. 6, p. 815.

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.