Formula: KAl(SO4)2 . 11H2O
Origin of name: From composition
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 19.92, b = 9.27, c = 8.304, β = 98.79°
Colour: Colourless, white
Diaphaneity: Transparent
Luster: Vitreous
Habit: Fibrous; an efflorescence
Hardness: 2 to 2.5
Specific gravity: 1.76
Cleavage: None
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties: Potash alum
Comments: Water soluble, fluorescent, phosphorescent
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