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Potassium feldspar

Description
Rock-forming silicates
Groups based upon tetrahedral arrangement
Micas – tetrahedra are arranged in sheets
Two types of mica are biotite (dark) and muscovite (light)
Feldspars – Three-dimensional network of tetrahedra    

Rock-forming silicates
Groups based upon tetrahedral arrangement
Feldspars – most abundant group of minerals in Earth’s crust
Quartz – three-dimensional network of tetrahedra    
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