mineral
Feldspar
Potassium or Plagioclase Feldspar (KAlSi3O8 - NaAlSi3O8)
AI-generated identification · may be incorrectMohs hardness of 6; pink, white, or grey color; vitreous to pearly luster; monoclinic or triclinic crystal system; distinct cleavage at nearly 90 degrees.
Identified More mineral →
Explore Feldspar in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness of 6; pink, white, or grey color; vitreous to pearly luster; monoclinic or triclinic crystal system; distinct cleavage at nearly 90 degrees.
Formation & geological history
Forms from cooling magma in igneous rocks like granite, and through metamorphic and sedimentary processes over geological timescales.
Uses & applications
Used primarily in the manufacture of glass, ceramics, pottery glazes, and occasionally as a gemstone.
Geological facts
Feldspar is the single most abundant group of minerals in the Earth's crust, making up about 60% of terrestrial rocks.
Field identification & locations
Identify by its rectangular crystal habit, good two-directional cleavage, and characteristic pink or white coloration. Commonly found worldwide in pegmatites and granitic terrains.
