Home Orthoclase
VIII - Tectosilicates (Feldspar Group)
Crystal habit of Orthoclase

Name   Orthoclase
Chemistry   K[AlSi3O8]
Hardness   6
Lustre   pearly - vitreous
Colour   white, yellow, red to brownish red, transparent - dull
Streak   white
Density [g/cm3]   2.55
Crystal habit   monoclinic, crystals columnar, tabular, prismatic, twins Carlsbad (100), Baveno (021), Manebach (001)
Cleavage, Fracture   [001] perfect, [010] good, fracture conchoidal to uneven
other characteristics and occurrences   perthit = orthoclase with albite intergrowth
important mineral in plutonic rocks (granite)

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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