Formula: CdSe
Origin of name: From composition
Crystal class: 6mm
Unit cell: a = 4.271 Å, c = 6.969 Å
Colour: Black
Diaphaneity: Opaque
Luster: Resinous to adamantine
Habit: Crystals minute, with hexagonal pyramid and base, horizontal striations
Hardness: 4
Specific gravity: 5.663
Cleavage: 1l perfect prismatic
Tenacity: Brittle
Streak: Black
Synonyms/varieties:
Comments: Found in sedimentary strata, under reducing secondary conditions of medium to high alkalinity
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