Formula: NiS2
Origin of name: for Johannes Vaes (1902-1978), Belgian mineralogist for the Union Miniere du Haut Katanga.
Crystal system: Cubic/Isometric
Crystal class: 2/m 3
Twinning:
Unit cell: a = 5.6793
Colour: Tin-white, steel gray, black
Diaphaneity: Opaque
Luster: Metallic to submetallic
Habit: Massive, disseminated, crystals octahedral or cubic
Hardness: 3.5
Specific gravity: 4.45
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with cattierite
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