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About

A generic name for (often poorly crystalline) soft manganese oxides/hydroxides, often containing significant amounts of hydroxides/oxides of other metals and adsorbed metals.

Mineral Data
Mixture Of: 
Physical Properties
Colour: 
Black, blue-black, brown
Streak: 
Black, bluish black, brownish black
Hardness: 
1 - 6.5
Tenacity: 
Brittle
Synonyms
Synonyms: 
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