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Chalcedony — specimens [gallery view] (Page 9)


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.
Psilomelane — specimen 0724
0724
Mexico
Psilomelane — specimen 0725
0725
Mexico
Psilomelane — specimen 0323
0323
Mexico

Chalcedony — specimens — 83
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