Home Oligoclase
VIII - Tectosilicates (Plagioclase Group)		 Crystal habit of Oligoclase
 
Name   Oligoclase
Chemistry   (Na,Ca)[Al[Al,Si)2SiO8]
Hardness   7
Lustre   vitreous
Colour   brown, colourless, greenish, grey, yellowish
Streak   white
Density [g/cm3]   2.62 - 2.76
Crystal habit   triclinic, crystals tabular, prismatic, twinning common
Cleavage, Fracture   [001] perfect, [010] good (94°), fracture conchoidal
other characteristics and occurrences   important rock forming mineral in igneous rocks
   
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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