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Chalcedony
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Chalcedony — specimen 0205, photo © NMNHS
Chalcedony
—
specimen 0205
Origin
Europe
Bulgaria, Haskovo, Stambolovo, Rabovo, 41.60905°N 25.64801°E, 185 m
Data
Weight:
9.41 ct;
size:
12.98 | 12.20 | 9.56 mm;
shape:
octagon;
colour:
light grey;
clarity:
translucent;
cut:
excellent;
treatment:
none.
Notes
Clean specimen; excellent step cut style 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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