Formula: (Mg,Fe,Mn)S
Origin of name: for H. Nininger, American meteoriticist
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: gray in reflected light
Diaphaneity:
Luster:
Habit: massive
Hardness:
Specific gravity: 3.21 to 3.68
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: from meteorites
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