mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
Hardness: 6 on the Mohs scale. Color: Salmon pink, flesh-red, or brownish. Luster: Vitreous to pearly. Crystal structure: Monoclinic or triclinic. Cleavage: Two directions at or near 90 degrees. Specific gravity: 2.5 - 2.6.
- Hardness
- 6 on the Mohs scale
- Color
- Salmon pink, flesh-red, or brownish
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6 on the Mohs scale. Color: Salmon pink, flesh-red, or brownish. Luster: Vitreous to pearly. Crystal structure: Monoclinic or triclinic. Cleavage: Two directions at or near 90 degrees. Specific gravity: 2.5 - 2.6.
Formation & geological history
Forms in igneous rocks like granite and syenite from cooling magma, as well as in pegmatites and metamorphic gneisses.
Uses & applications
Used in the manufacture of ceramics, porcelain, glass, and as a gemstone or decorative specimen.
Geological facts
Feldspar is the single most common mineral group in the Earth's crust, making up about 41% of it.
Field identification & locations
Identified easily by its distinctive pink to salmon color and two cleavage planes meeting at roughly right angles. Found worldwide in granitic terrains.
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Schist
Schist
Metamorphic