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Bityite

#RE7927

Bityite

#RE7927
Availability
Sold
Size
7.5 x 4.5 x 4.5 cm - Sm Cabinet 
Formula
CaLiAl2(Si2BeAl)O10(OH)2 (RRUFF)
Locality
Harding mine, Taos Co., New Mexico, United States

Phyllosilicate - Monoclinic - Mica group member. Brittle Mica - Trioctahderal. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Bityite is a brittle mica since calcium cations assume the position in the interlayer instead of potassium. Beryllium replaces some of the silicon cations in the Tetrahedral positions and lithium takes on the positions in the Octahedral positions between the layers. One of a handful of lithium micas and the only one with essential beryllium.

Usually occurs as thin tabular and pseudohexagonal crystals to 2mm or as rosettes of dense or compact aggregates. Found sparingly in lithium rich pegmatites. (Encycl. of Min.). Weak yellow Fl.

This is a nice specimen with countless small 1-2mm white platy crystals on Biotite matrix. The Bityite exhibits weak yellow FL.

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 

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
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