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Chalcedony
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Chalcedony — specimen 0692, photo © NMNHS
Chalcedony
—
specimen 0692
Origin
no precise locality [Africa]
Data
Weight:
0.67 ct;
size:
6.13 | 5.28 | 4.48 mm;
shape:
hexagon;
colour:
light grey;
clarity:
translucent;
cut:
excellent;
treatment:
none.
Notes
Clean specimen; design ‘Hexamixtum S 41-32’ [pavilion angle changed to 45.00], excellent cut by Tan Pen.
Other specimens
More specimens
More information from ‘Classification’
Chalcedony
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
.
Gemmology — gemstones
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