Description
Aggregate of hausmannite crystals on gangue, named after Jean-Frédéric-Louis Hausmann, German mineralogist (1782-1859).
The pseudo-octahedral crystals are shiny black, with a beautiful metallic luster.
Hausmannite is a manganese oxide with worldwide occurrences.
This specimen comes from the Black Rock mine in South Africa, in the large collection of Belgian chemist René Hubin.
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