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www.mineralgallery.co.za Minerals F-J |
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Heterogenite |
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Name
Heterogenite
Chemistry
CoO(OH)
Uses
As a minor ore of cobalt
Color
Black to charcoal
Hardness
4-5
Specific gravity
4.3
Streak
Brown black
Crystals
It forms shiny black coatings and Trigonal - Hexagonal Scalenohedral H-M Symbol (-3 2/m) Space Group: R3m
Accompanied by:
Calcite and sometimes malachite
Similar to
Secondary mineral of smaltite
The only cobalt oxide is heterogenite which forms masses up to several kilograms and black coatings on calcite.
This was a scarce mineral at Tsumeb and was only found at two levels with very few specimens. It is also found at Zaire as a black coating on malachite. It contains 64.1 % cobalt and 1 % hydrogen and 34.8 % oxygen. The habit can best be described as amorphous - No crystalline form or imitative shape., Globular - Spherical, or nearly so, rounded forms (e.g. wavellite)., Reniform - "Kidney like" in shape (e.g.. hematite)
