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From Wikipedia, the free encyclopedia
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.
Axinite | |
---|---|
![]() Manganaxinite | |
General | |
Category | Cyclosilicates |
Formula (repeating unit) | (Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH) |
IMA symbol | Ax[1] |
Strunz classification | 9.BD.20 |
Crystal system | Triclinic |
Crystal class | Pinacoidal (1) (same H-M symbol) |
Space group | P1 |
Identification | |
Color | Reddish brown to yellow to colorless. Blue, violet, grey. |
Crystal habit | Tabular, wedge shaped crystals |
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 | [2][3] |
The axinite group includes:
Axinite is sometimes used as a gemstone.[8]
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