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Mineralpedia Details for Anorthite

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Anorthite

Anorthite

Formula
CaAl2Si2O8 
Crystal System
Triclinic 
Crystal Habit
Granular, Euhedral Crystals, Striated 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, white, red, reddish gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
WebMineral
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Mindat
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Anorthite from Monte Somma, Vesuvius, Campania, Italy

Anorthite
            from Monte Somma, Vesuvius, Campania, Italy

Colorless, glassy 2-4mm sharp crystals in volcanic vugs. Anorthite is the calcium end member of the plagioclase series.

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Anorthite var. bytownite from Eycott Hill, Keswick, Keswick dist., Cumbria, England

Anorthite var. bytownite
            from Eycott Hill, Keswick, Keswick dist., Cumbria, England

Bytownite is a calcium rich member of the plagioclase series with 10-30% Albite. It is a variety of Anorthite the calcium end member. These are anhedral phenocrysts in basalt.

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