Formula: VS4 (?)
Origin of name: for A. Rizo-Patrona, Peruvian engineer
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: greenish black to black
Diaphaneity:
Luster: metallic
Habit: massive, fine-grained, graphite-like
Hardness: low
Specific gravity: 2.82
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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