Formula: Pb10AgBi5S18
Origin of name: For Jaroslav Heyrovsky, Czech chemist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Lead-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals flattened, elongated parallel to c-axis
Hardness: 3.5 to 4
Specific gravity: 7.17
Cleavage: None
Tenacity:
Streak: Grayish-black
Synonyms/varieties:
Comments:
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