Formula: 6Fe0.9S.5(Mg,Fe)(OH)2
Origin of name: for Mitrofan S. Tochilin (1910-1968), Russian mineralogist
Crystal system: Monoclinic
Crystal class: 2, m, 2/m or 1
Twinning:
Unit cell:
Colour: Bronze-black
Diaphaneity: Opaque
Luster: Moderately metallic
Habit: crystals acicular, in radiating fibrous aggregates, granular aggregates, cylindrical acicular crystals which may be hollow, as paper-thin coatings, felted masses, as clots
Hardness: 1-1.5
Specific gravity: 2.96
Cleavage: 1; {001} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Found in ultramafic bodies, diamond pipes, and carbonaceous chondrite meteorites.
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