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Axinite

Axinite
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General
CategoryMineral
Chemical formula calcium aluminum boro-silicate,

(Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH)

Identification
Colour Reddish brown to yellow to colorless. Blue, violet, grey.
Crystal habit Tabular, wedge shaped crystal
Crystal system Triclinic
Cleavage Good
Fracture Conchoidal
Mohs Scale hardness 6.5-7
Luster Vitreous
Refractive index 1.68-1.723
Pleochroism Strong
Streak White
Specific gravity 3.26-3.41
Fusibility ?
Solubility ?
Major varieties
None


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

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