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Mineralpedia Details for Allanite-(Y)

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Allanite-(Y)

Allanite-(Y)

Formula
CaYFe2+Al2(Si2O7)(SiO4)O(OH) 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Disseminated 
Cleavage
Imperfect, Imperfect, None 
Luster
Vitreous - Greasy 
Color
brown, black 
Streak
grayish brown 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
5.5 
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