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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
.
0724
Mexico
0725
Mexico
0323
Mexico
Chalcedony — specimens — 83
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Gemmology — gemstones
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