Formula: (Ag,Cu)2S
Origin of name: For Hugh McKinstry (1896-1961), American economic geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.043, b = 15.677, c = 7.803
Colour: Steel-gray, tarnishes to dark gray or black
Diaphaneity: Opaque
Luster: Metallic
Habit: Granular aggregates of interlocked crystals, microscopic crystals
Hardness: 1.5-2.5
Specific gravity: 6.61
Cleavage: 1; poor
Tenacity: Subconchoidal fracture
Streak: Dark gray
Synonyms/varieties:
Comments:
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