Formula: (Co,Mg)Al2(SO4)4.22H2O
Origin of name: for the prehistoric pueblo dwelling near the locality Wupatki, Arizona, U.S.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 6.189, b = 24.23, c = 31.2, β = 100.33°
Colour: Light pink, pink, rose
Diaphaneity: Transparent to semitransparent
Luster: Silky
Habit: fibers 5 to 10 micron up to 8 mm long forming cross-fiber veinlets
Hardness: 1.5-2
Specific gravity: 1.87-1.92
Cleavage: {012} distinct, at 70° to fiber length
Tenacity: Splintery fracture
Streak: White
Synonyms/varieties:
Comments: Co analogue of halotrichite, soluble in water
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