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Orthoclase VIII - Tectosilicates (Feldspar Group)

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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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