What are the varieties of chalcedony?
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Related entries at Encyclopedia.com
chalcedony
A Dictionary of Chemistry
...chalcedony A mineral consisting of a microcrystalline variety of quartz. It occurs in several forms, including a large number of semiprecious gemstones; for example, sard, carnelian, jasper, onyx, chrysoprase, agate, and tiger's-eye.
agate
A Dictionary of Chemistry
...agate A variety of chalcedony that forms in rock cavities and has a pattern of concentrically...red. Moss agate does not show the same banding and is a milky chalcedony containing mosslike or dendritic patterns formed by inclusions...
jasper
The Oxford American College Dictionary
...jas·per / ˈjæspər/ • n. 1. an opaque reddish-brown variety of chalcedony. 2. a kind of hard fine porcelain invented by Josiah Wedgwood and used for Wedgwood cameos and other delicate work. ORIGIN: Middle English...
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