Formula: mixed manganese oxides
Origin of name: from Greek for smooth or naked, and black
Crystal system:
Crystal class:
Twinning:
Unit cell:
Colour: black
Diaphaneity:
Luster:
Habit: probably a massive form of mixed manganese oxides
Hardness:
Specific gravity:
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: the name is used for two materials, a black mixture of manganese oxides and as a synonym for romanechite
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