Formula: Al4(SO4)(OH)10 . 5H2O
Origin of name: From composition, a basic sulfate of aluminum
Crystal system: Hexagonal (possibly monoclinic)
Crystal class: Unknown
Twinning:
Unit cell: a = 22.56 Ǻ, c = 18.72 Ǻ
Colour: White; stained yellow, orange or brown by impurities
Diaphaneity:
Luster: Dull
Habit: Massive; compact to powdery
Hardness:
Specific gravity: 2.10 to 2.12
Cleavage: None
Tenacity: Conchoidal in compact masses
Streak:
Synonyms/varieties:
Comments:
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