Formula: Zn1-xAlx(SO4)x/2(OH)2.nH2O
Origin of name: For its relationship to woodwardite as its zinc analogue
Crystal system: Trigonal
Crystal class: -3
Twinning:
Unit cell: a = 3.0364 Å, c = 8.85 Å
Colour: Pale bluish to bluish-white
Diaphaneity: Translucent
Luster: Waxy
Habit: Tabular, pseudohexagonal
Hardness: 1
Specific gravity: 2.66 - 2.71, Average = 2.68 (2.42 calculated)
Cleavage: None observed
Tenacity: Sectile fracture
Streak: White to bluish-white
Synonyms/varieties:
Comments: Composed of intergrown 1T and 3R polytypes.
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