Gemmology
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Psilomelane — specimen 0323, photo © NMNHS
Psilomelane — specimen 0323, photo © NMNHS

Psilomelanespecimen 0323

Origin

Central America
Mexico
Psilomelane — specimen 0323, locality map
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
Psilomelane — specimen 0724Psilomelane — specimen 0725

More information from ‘Classification’


Obsolete group name for manganese oxides; mainly romanèchite in chalcedony.