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Difference between revisions of "Chalcedony"
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[[File:Chalcedony stone.jpg|400px|thumb|Specimen of natural chalcedony]] | [[File:Chalcedony stone.jpg|400px|thumb|Specimen of natural chalcedony]] | ||
'''Chalcedony''' is a cryptocrystalline form of silica, composed of very fine intergrowths of [[quartz]] and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. | '''Chalcedony''' is a cryptocrystalline form of silica, composed of very fine intergrowths of [[quartz]] and moganite. These are both silica minerals, but they differ in that quartz has a trigonal [[crystal]] structure, while moganite is monoclinic. | ||
Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black. The color of chalcedony sold commercially is often enhanced by dyeing or heating. | Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black. The color of chalcedony sold commercially is often enhanced by dyeing or heating. | ||