mineral
Feldspar
KAlSi3O8 to NaAlSi3O8
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically white, pink, or gray with a vitreous to pearly luster and good cleavage in two directions at right angles.
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Physical properties
Hardness of 6 on the Mohs scale, typically white, pink, or gray with a vitreous to pearly luster and good cleavage in two directions at right angles.
Formation & geological history
Forms in igneous rocks like granite and pegmatites through fractional crystallization of cooling magma.
Uses & applications
Used extensively in the manufacture of glass, ceramics, porcelain, and occasionally as a gemstone.
Geological facts
Feldspar is the most abundant mineral group in the Earth's crust, making up about 60% of terrestrial rocks.
Field identification & locations
Identified by its rectangular crystal habit, 90-degree cleavage planes, and moderate hardness that resists scratching by a knife.
