Formula: Cu2Se
Origin of name: For Elleodoro Bellido Bravo, Peruvian geologist, director of servicio de Geología y Minería, Peru
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell: a = 11.52 Å, b = 11.52 Å, c = 11.74 Å
Colour: Yellow white (reflected light)
Diaphaneity: Opaque
Luster: Metallic
Habit: Microscopic anhedral grains
Hardness: <3
Specific gravity: 7.03
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with berzelianite. Formed at moderate to low temperature with other hydrothermal selenides and sulfides
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