Orthoclase photograph

Orthoclase

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Color Green
Yellow
LusterVitreous
Crystal systemMonoclinic crystal system
Chemical formulaKAlSi₃O₈
Hardness (Mohs hardness scale)6 – 6. 5
Mineral classSanidine
Date of Reg.
Date of Upd.
ID1077817
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About Orthoclase


Orthoclase, or orthoclase feldspar, is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar.

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