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Find Anorthite
 Anorthite Info
 Anorthite in the Free Online Encyclopedia



Anorthite

Anorthite is one of the plagioclase feldspars, an important group of minerals abundant in the Earth's crust. Anorthite's chemical formula is CaAl2Si2O8.

Contents

Mineralogy

Anorthite is the calcium-rich endmember of the plagioclase system, the other endmember being albite (sodium-rich). The range of intermediate compositions have varying ratios of calcium and sodium ions.

Occurrence

Anorthite occurs in igneous and metamorphic rocks. Its type localities are Monte Somma and Valle di Fassa, Italy,

Details

Crystallographic system Triclinic
Colours Normally colourless or white, colourless in thin section.
Lustre Vitreous
Hardness 6-6.5
Refractive index 1.51
Cleavage 3: 1 perfect, 1 good, 1 poor
Twinning Multiple lamellar and Carlsbad twins
Pleochroism Yellow to dark green to transparent to opaque


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