Formula: MgAl(SO4)2F.18H2O
Origin of name: for William Wilcox, American prospector, who discovered this mining district in 1879. He was killed by Apache Indians in 1880.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 14.9, b = 6.65, c = 6.77, α = 117.433°, β = 100.583°, γ = 89.167°
Colour: Colourless, pale blue, pale green, will become milky white on exposure to air
Diaphaneity: Transparent to translucent
Luster: Greasy
Habit: Crystals prismatic, encrustations, efflorescences, spongy masses, may be stalactitic
Hardness: 2
Specific gravity: 1.58
Cleavage: none
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments: Water soluble, will dissolve in its own water
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