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Chalcedony — specimen 0183, photo © NMNHS
no precise locality [Africa]
7.11 | 5.08 | 3.85 mm;
medium dark bluish purple; strong;
Clean specimen; cabochon style cut.
More information from ‘Classification’
Traditionally defined as a fibrous cryptocrystalline variety of quartz. More recently, it has been shown that much chalcedony is a mixture of quartz and
. Pure chalcedony may contain trace amounts of
Gemmology — gemstones
National Museum of Natural History, Sofia
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None of the specimens illustrated in this site is on display in the permanent exhibition of the National Museum of Natural History, Sofia.