mineral
Feldspar (Plagioclase / Potassium Feldspar)
Feldspar Group (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, vitreous to pearly luster, white to off-white/cream with yellowish-brown staining, blocky crystal habit with distinct 90-degree cleavage planes.
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Physical properties
Hardness 6 on Mohs scale, vitreous to pearly luster, white to off-white/cream with yellowish-brown staining, blocky crystal habit with distinct 90-degree cleavage planes.
Formation & geological history
Forms in igneous rocks like granite and pegmatites through cooling magma, as well as high-grade metamorphic rocks.
Uses & applications
Used widely in manufacturing glass and ceramics, as an abrasive, and occasionally as a gemstone or ornamental stone.
Geological facts
Feldspar is the most abundant group of minerals in the Earth's crust, making up about 60% of terrestrial rocks.
Field identification & locations
Look for right-angle stair-step cleavage surfaces with a pearly or vitreous sheen; common worldwide in igneous and metamorphic terrains.
