Feldspar Group

Mineral name: Feldspars are a group of minerals made of aluminum, silicon, and oxygen. Examples include orthoclase, plagioclase, labradorite, and microcline.

Chemical formula: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8

Physical properties: vitreous luster, hardness 6, white streak, two directions of cleavage


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