Formula: FeSe
Origin of name: named after L. Achaval
Crystal system: Hexagonal
Crystal class: 6/mmm
Twinning:
Unit cell: a = 3.636 Å, c = 5.946 Å, α = 90°, β = 120°
Colour: Dark gray
Diaphaneity: Opaque
Luster: Metallic
Habit:
Hardness: 2.5
Specific gravity:
Cleavage:
Tenacity:
Streak: Gray-black
Synonyms/varieties:
Comments: Never adequately described
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