Formula: Se
Origin of name: from Greek for the moon
Crystal system: hexagonal
Crystal class: 32
Twinning:
Unit cell: a = 4.37 Å, c = 4.95 Å
Colour: gray, purple-gray, reddish when globular
Diaphaneity:
Luster: metallic, vitreous
Habit: crystals acicular, may be hollow or tube-like, felted aggregates or sheets, glossy globules, small
Hardness: 2
Specific gravity: 4.80
Cleavage: 1; {01-12} distinct
Tenacity: crystals flexible
Streak: red
Synonyms/varieties:
Comments:
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