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Mineralpedia Details for Bityite

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Bityite

Bityite

Formula
CaLiAl2(Si2BeAl)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Platy, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown white, colorless, yellow, pearl white 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
5.5 
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Bityite from Maharitra, Sahatany Pegmatite Field, Mt Ibity area, Antananarivo, Madagascar

Bityite
            from Maharitra, Sahatany Pegmatite Field, Mt Ibity area, Antananarivo, Madagascar

This is actually a very good specimen showing colorless or creamy, thick hexagonal plates.

One of a handful of lithium micas and the only one with essential beryllium. More information about micas can be found in this article:  Micas and other Phyllosilicates. It is chiefly a pegmatite mineral.

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