Department of Geological and Environmental Sciences

Light Colored Minerals with Non-Metallic Lusters, Harder than Glass, Cleavage

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Physical PropertiesMineral Name, Formula
PINK, TAN, white, or green color; 2-way right angle cleavage; H=6.POTASSIUM FELDSPAR,  
  KAlSi3O8
WHITE, light gray color; 2-way, right angle cleavage; STRIATIONS on some cleavage faces; H=6.PLAGIOCLASE FELDSPAR,  
  (Na,Ca)(Al,Si)4O8, Na>Ca