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Chalcedony — specimen 0691, photo © NMNHS
no precise locality [Africa]
8.89 | 7.72 | 4.17 mm;
Clean specimen; design ‘Hexamixtum S 41-32’ [pavilion angle changed to 35.00], excellent cut by Tan Pen.
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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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.