Formula: (Ca,Mn)S
Origin of name: for T. Oldham, Irish geologist
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: light brown
Diaphaneity: transparent
Luster:
Habit: small spherules
Hardness: 4
Specific gravity: 2.58
Cleavage: 1; {001}
Tenacity:
Streak:
Synonyms/varieties:
Comments: from meteorites
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