Axinite
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| Axinite | |
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| Image required | |
| General | |
| Category | Mineral |
| 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.