Gemmology
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Chalcedony — specimens [gallery view]


Traditionally defined as a fibrous cryptocrystalline variety of quartz. More recently, it has been shown that much chalcedony is a mixture of quartz and mogánite. Pure chalcedony may contain trace amounts of silanol groups.
Chalcedony — specimen 0088
0088
Brazil
Chalcedony — specimen 0403
0403
Brazil
Chalcedony — specimen 0180
0180
no precise locality
Chalcedony — specimen 0510
0510
no precise locality
Chalcedony — specimen 0511
0511
no precise locality
Chalcedony — specimen 0512
0512
no precise locality
Chalcedony — specimen 0580
0580
Africa
Chalcedony — specimen 0591
0591
Africa
Chalcedony — specimen 0225
0225
Africa
Chalcedony — specimen 0688
0688
Africa

Chalcedony — specimens — 83
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