Anorthite

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Anorthite
Anorthite from Japan
General
CategoryFeldspar mineral
Chemical formulaCaAl2Si2O8
Identification
ColorWhite, grayish, reddish
Crystal habitAnhedral to subhedral granular
Crystal systemTriclinic
TwinningCommon
CleavagePerfect [001] good [010] poor [110]
FractureUneven to concoidal
TenacityBrittle
Mohs scale hardness6
LusterVitreous
DiaphaneityTransparent to translucent
Specific gravity2.72 - 2.75
Optical propertiesBiaxial (-), 2V 78° to 83°
Refractive indexnα = 1.573 - 1.577 nβ = 1.580 - 1.585 nγ = 1.585 - 1.590
Birefringenceδ = 0.012 - 0.013
References[1][2][3]

Anorthite


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