Formula: Al12(SO4)5(OH)26. 20H2O
Origin of name: For Mohammed Zaher, Bangladeshi geologist, Geological Survey of Bangladesh, who discovered the mineral
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning:
Unit cell: a = 18.475, b = 19.454, c = 3.771, α = 95.24°, β = 91.48°, γ = 80.24°
Colour: White
Diaphaneity: Transparent to translucent
Luster: Pearly to earthy
Habit: Massive, fine-grained, in veinlets
Hardness: 3.5
Specific gravity: 2.01
Cleavage: 1; probably basal, good
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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