Axinite
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| Axinite | |
|---|---|
 Axinite – Deposit Topotype, France |
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| General | |
| Category | Borosilicates |
| Chemical formula | (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 crystals |
| Crystal system | Triclinic |
| Cleavage | Good on {100} |
| Fracture | Conchoidal |
| Mohs scale hardness | 6.0–7.5 |
| Luster | Vitreous |
| Streak | White |
| Specific gravity | 3.18–3.37 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.672–1.693 nβ = 1.677–1.701 nγ = 1.681–1.704 |
| Birefringence | δ = 0.011 |
| Pleochroism | Strong |
| References | [1][2] |
Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH. Axinite is pyroelectric and piezoelectric.
The axinite group includes:[1]
- Axinite-(Fe), ferro-axinite, iron rich, lilac brown to black
- Axinite-(Mg), magnesio-axinite, magnesium rich, pale blue to gray
- Axinite-(Mn), manganaxinite, manganese rich, yellow-orange
- Tinzenite, iron – manganese intermediate, yellow
[edit] Gallery
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Clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at Dalnegorsk, Russia
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Chloritized bladed crystals of Axinite forming on Adularia from the Swiss Alps
[edit] References
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