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Chalcedony — specimen 0403, photo © NMNHS
6.52 | 5.54 | 4.21 mm;
medium very strongly bluish green; slightly greyish;
Very clean specimen; design ‘Ovalimixtum C 43-32’, 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.