Formula: MgAl2(SO4)4.22H2O
Origin of name: for John Pickering, American philologist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless, white, may have yellowish or reddish tinge
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals acicular, aggregates, fibrous or acicular, incrustations, efflorescence
Hardness: 1.5
Specific gravity: 1.79
Cleavage: 1; {010} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with halotrichite, soluble in water
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