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Psilomelane
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Psilomelane — specimen 0323, photo © NMNHS
Psilomelane
—
specimen 0323
Origin
Central America
Mexico
Data
Weight:
2.65 ct;
size:
12.88 | 7.70 | 4.78 mm;
shape:
hexagon;
colour:
medium dark grey;
clarity:
opaque;
cut:
excellent;
treatment:
none.
Notes
Clean specimen; design ‘Hexaelongatis 2’, excellent cut by Tan Pen.
Other specimens
More information from ‘Classification’
Psilomelane
Obsolete group name for manganese oxides; mainly
romanèchite
in chalcedony.
Gemmology — gemstones
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