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Anorthoclase

#PD39996

Anorthoclase

#PD39996
Availability
Sold
Size
5.5 x 3.5 x 3.5 cm - Sm Cabinet 
Formula
(Na,K)AlSi3O8 (RRUFF)
Locality
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. 

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

Data courtesy of Webmineral.

Collection
Phillips Collection

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