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Chalcedony — specimen 0694, photo © NMNHS
Chalcedony — specimen 0694, photo © NMNHS

Chalcedonyspecimen 0694


no precise locality [Africa]

Weight: 2.06 ct; size: 9.98 | 8.67 | 5.07 mm; shape: hexagon; colour: light grey; clarity: translucent; cut: excellent; treatment: none.

Clean specimen; design ‘Hexamixtum S 41-32’ [pavilion angle changed to 35.00], excellent cut by Tan Pen.

Other specimens
Chalcedony — specimen 0088Chalcedony — specimen 0403Chalcedony — specimen 0180Chalcedony — specimen 0510Chalcedony — specimen 0511Chalcedony — specimen 0512Chalcedony — specimen 0580Chalcedony — specimen 0591Chalcedony — specimen 0225Chalcedony — specimen 0688Chalcedony — specimen 0418Chalcedony — specimen 0558Chalcedony — specimen 0179Chalcedony — specimen 0183Chalcedony — specimen 0404Chalcedony — specimen 0265Chalcedony — specimen 0348Chalcedony — specimen 0684

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 mogánite. Pure chalcedony may contain trace amounts of silanol groups.