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Axinite



Axinite

Axinite from California
General
CategoryMineral
Chemical formulacalcium aluminum boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH)
Identification
ColorReddish brown to yellow to colorless. Blue, violet, grey.
Crystal habitTabular, wedge shaped crystal
Crystal systemTriclinic
CleavageGood
FractureConchoidal
Mohs Scale hardness6.5-7
LusterVitreous
Refractive index1.68-1.723
PleochroismStrong
StreakWhite
Specific gravity3.26-3.41

Axinite is a brown to violet-brown, or reddish-brown bladed mineral composed of calcium aluminum boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH. Axinite is pyroelectric and piezoelectric.    

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Axinite". A list of authors is available in Wikipedia.
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