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Mineralpedia Details for Anorthoclase

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Anorthoclase

Anorthoclase

Formula
(Na,K)AlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Disseminated, Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, green, gray, gray pink, yellow 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
WebMineral
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Mindat
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Anorthoclase from Larvik, Vestfold, Norway

Anorthoclase
            from Larvik, Vestfold, Norway

Compact, tight dark crystals to 1cm in gabbro, a typical association. Anorthoclase is a variety of feldspar intermediate between Sanidine (K) and Albite (Na). The feldspar group is actually a ternary system with Na - Ca - K at the corners. 

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