Formula: (Ni,Fe)S2
Origin of name: For J. J. Bravo, Peruvian scientist
Crystal system: Cubic
Crystal class: 2/m -3
Unit cell: a = 5.57 Ǻ
Colour: Steel-gray
Diaphaneity:
Habit: Crystals indistinct cubic, octahedral or pyritohedral; nodular masses or crusts
Hardness: 5.5 to 6
Specific gravity: 4.82
Cleavage: 1; {001}
Tenacity: Conchoidal to uneven; brittle
Synonyms/varieties:
Comments:
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