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Mineralpedia Details for Cookeite

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Cookeite

Cookeite

Formula
(Al,Li)3Al2(Si,Al)4O10(OH)8 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, green, brown, yellowish white, pinkish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5 
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