Formula: FeAl2(SO4)4 . 22H2O
Origin of name: From Latin, halotrichum = salt hair
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, white, yellowish, greenish
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals acicular, usually not terminated; incrustations; efflorescence
Hardness: 1.5
Specific gravity: 1.89
Cleavage: 1; {010} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with pickeringite; soluble in water
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