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Psilomelane — specimen 0725, photo © NMNHS
Psilomelane — specimen 0725, photo © NMNHS

Psilomelane — specimen 0725

Origin

Central America
Mexico
Psilomelane — specimen 0725, locality map
Data

Weight: 1.53 ct; size: 5.81 | 4.54 | 4.08 mm; shape: rectangle; colour: medium dark grey; clarity: opaque; cut: excellent; treatment: none.
Notes

Clean specimen; design ‘Rectangulum Cab’, excellent cut by Tan Pen.

Other specimens
Psilomelane — specimen 0724Psilomelane — specimen 0323

More information from ‘Classification’

Psilomelane

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


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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.