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Allanite-(Y)

Mineral Data
{CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Physical Properties
Colour: 
Black
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.5
Tenacity: 
very brittle
Synonyms
Synonyms: 
Allanite-Y, Allanite Y and Allanite - Y