Formula: Cu Zn
Origin of name: for Zhang Heng, ancient Chinese astronomer
Crystal system: Cubic
Crystal class: 4/m 3 2/m
Twinning:
Unit cell: a = 2.952
Colour: Golden yellow
Diaphaneity: Opaque
Luster: Metallic
Habit: Granular irregular grains and tabular, dendritic, grains , may be striated in multiple directions producing cross-hatching
Hardness: 3.5-4
Specific gravity: 8.32
Cleavage: None
Tenacity:
Streak: Bronze
Synonyms/varieties:
Comments: Darkens readily in air; from a meteorite
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