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Mineralpedia Details for Alunite

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Alunite

Alunite

Formula
KAl3(SO4)2(OH)6 
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Earthy, Fibrous 
Cleavage
Good, None, None 
Luster
Vitreous - Pearly 
Color
white, gray, yellowish gray, reddish gray, yellowish white 
Streak
white 
Class
Trigonal 
Fracture
Uneven 
Hardness
3.5-4 
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