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Chalcedony | | Chalcedony: Encyclopedia - Chalcedony | | | Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. Chalcedony may be semitransparent or translucent and is usually white to gray, grayish-blue or some shade of brown, sometimes nearly black. Other shades have been given different names. A clear red chalcedony is known as carnelian or sard; a green variety colored by nickel oxide is called chrysoprase. Prase is a dull green and onyx is black and white banded. Plasma is a bright to emerald-green chalcedony that is sometimes found with small ...
| | | Chalcedony, List of minerals | | |
| | | Chalcedony: Encyclopedia - Chalcedony
Chalcedony
Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. Chalcedony may be semitransparent or translucent and is usually white to gray, grayish-blue or some shade of brown, sometimes nearly black. Other shades have been given different names. A clear red chalcedony is known as carnelian or sard; a green variety colored by nickel oxide is called chrysoprase. Prase is a dull green and onyx is black and white banded. Plasma is a bright to emerald-green chalcedony that is sometimes found with small spots of jasper resembling blood drops; it has been referred to as blood stone or heliotrope. Chalcedony is one of the few minerals other than quartz that is found in geodes.
The term chalcedony is derived from the name of the ancient Greek town Chalkedon in Asia Minor, in modern English usually spelled Chalcedon.
See also
Categories: Minerals | Quartz varieties | Lithics
Other related archivesAsia Minor, Chalcedon, Greek, List of minerals, Lithics, Minerals, Prase, Quartz varieties, blood, carnelian, chrysoprase, cryptocrystalline, geodes, jasper, luster, mineral, nickel, onyx, oxide, quartz, sard
 Adapted from the Wikipedia article "Chalcedony", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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