Anorthite

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Anorthite
Anorthite from Japan
General
Category Feldspar mineral
Chemical formula CaAl2Si2O8
Identification
Color White, grayish, reddish
Crystal habit Anhedral to subhedral granular
Crystal system Triclinic
Twinning Common
Cleavage Perfect [001] good [010] poor [110]
Fracture Uneven to concoidal
Tenacity Brittle
Mohs scale hardness 6
Luster Vitreous
Diaphaneity Transparent to translucent
Specific gravity 2.72 - 2.75
Optical properties Biaxial (-), 2V 78° to 83°
Refractive index nα = 1.573 - 1.577 nβ = 1.580 - 1.585 nγ = 1.585 - 1.590
Birefringence δ = 0.012 - 0.013
References [1][2][3]

Anorthite


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