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Psilomelane

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

See:
Chalcedony
Psilomelane — specimen 0323
Psilomelane — specimen 0323, photo © NMNHS

Material from ‘Repository’

3 specimens: 0724 — 2.07 ct, Mexico; 0725 — 1.53 ct, Mexico; 0323 — 2.65 ct, Mexico.


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