Formula: Cu2Se
Origin of name: For Baron Jons Berzelius, Swedish chemist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 5.694 Å
Colour: Lead-gray with faint bluish tint
Diaphaneity: Opaque
Luster: Metallic
Habit: As dendritic crusts and thin veinlets
Hardness: 2
Specific gravity: 6.65 to 6.71
Cleavage: None
Tenacity:
Streak: Shining
Synonyms/varieties:
Comments: Dimorphous with bellidoite. Found with other selenides in hydrothermal veinlets in dolomite; in iron ores, with other selenides in calcite veins in serpentine, in gold-quartz-orthoclase deposit
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