Formula: Al
Origin of name: From Latin alumen = alum, a compound containing the element
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Unit cell: a = 4.04 Å
Colour: Grayish white
Diaphaneity: Opaque
Habit: Elongate lamellar grains
Hardness: 2 to 3
Specific gravity: 2.70 (calculated)
Cleavage: None
Synonyms/varieties:
Comments:
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