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chalcedony |
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chalcedony (kălsĕd`ənē) [from Chalcedon Chalcedon (kăl`sĭdŏn, –dən, kălsē`dən), ancient Greek city of Asia Minor, on the Bosporus. ..... Click the link for more information. ], form of quartz the crystals of which are so minute that its crystalline structure cannot be seen except with the aid of a microscope. Chalcedony has a waxy luster and is translucent to transparent. The name chalcedony is applied more specifically to white, gray, blue, and brown varieties. Some varieties, differing in color because of the presence of impurities, are agate agate (ăg`ĭt), translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony . ..... Click the link for more information. , bloodstone, carnelian carnelian (kärnēl`yən) or cornelian ..... Click the link for more information. , chrysoprase, jasper jasper, opaque, impure cryptocrystalline quartz , usually red, but also yellow, green, and grayish blue. It is used as a gem. Ribbon jasper has the colors in stripes. ..... Click the link for more information. , onyx onyx (ŏn`ĭks), variety of cryptocrystalline quartz , differing from agate only in that the bands of which it is composed are ..... Click the link for more information. , sard, and sardonyx. chalcedonyor calcedonyVery fine-grained variety of the silica mineral quartz. A form of chert, it occurs in a great variety of colours, usually bluish white, gray, yellow, or brown. Other physical properties are those of quartz. For centuries, chalcedony has been the stone most used by gem engravers, and many varieties are still cut and polished as ornamental stones. See also agate; carnelian; onyx. chalcedony a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2 chalcedony [kal′sed·ən·ē] (mineralogy) A cryptocrystalline variety of quartz; occurs as crusts with a rounded, mammillary, or botryoidal surface and as a major constituent of nodular and bedded cherts; varieties include carnelian and bloodstone. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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03 opt; whereas drill hole MS-2 hit a 40-foot thick zone of chalcedonic veining at 160-200 feet, which ran 0. Veins associated with higher gold values, (greater than 1 g/t Au), generally consist of fine grained or chalcedonic quartz with weak to moderate banding. Large boulders up to 5m in width of silicified conglomerate with chalcedonic, banded and crackle brecciated epithermal quartz with fine pyrite were initially identified in a small stream and traced back to outcrops. |
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