Axinite
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| Axinite | |
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 Axinite from California
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| General | |
| Category | Mineral |
| Chemical formula | calcium aluminium boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH) |
| Identification | |
| Color | 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 |
Axinite is a brown to violet-brown, or reddish-brown bladed mineral composed of calcium aluminium boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH. Axinite is pyroelectric and piezoelectric.
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