AnorthiteAnorthite is one of the plagioclase feldspars, an important group of minerals abundant in the Earth's crust. Anorthite's chemical formula is CaAl2Si2O8.
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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.
|Colours||Normally colourless or white, colourless in thin section.|
|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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