Formula: (Fe,Ni)9S8
Origin of name: Locality; Mackinaw Mine, Snohomish Co., Washington
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Bronze; white-gray on fresh surfaces
Diaphaneity:
Luster: Metallic
Habit: Crystals euhedral; tetragonal basal plates or simple pyramidal combinations; massive, feathery lamellae or irregular grains
Hardness: ~ 2.5
Specific gravity: 4.30
Cleavage: 1; {001} perfect
Tenacity:
Streak: Black powder
Synonyms/varieties:
Comments: Ni not essential in formula
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