Formula: RuS2
Origin of name: For Laura Joy, wife of American chemist
Crystal system: Cubic
Crystal class: 2/m -3
Twinning:
Unit cell:
Colour: Iron-black
Diaphaneity: Opaque
Luster: Bright metallic
Habit: Crystals cubic, octahedral or pyritohedral, minute; small rounded grains
Hardness: 7.5
Specific gravity: 6.4 to 6.99
Cleavage: 1; {111} perfect
Tenacity:
Streak: Dark grey powder
Synonyms/varieties:
Comments: Series with erlichmanite
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