mineral

Kfeldspar (Potassium Feldspar)

KAlSi3O8

AI-generated identification · may be incorrect

Hardness: 6 on the Mohs scale; Color: Typically pink, salmon-pink, or reddish; Luster: Vitreous to pearly; Crystal structure: Monoclinic or triclinic; Cleavage: Good in two directions at nearly 90 degrees; Specific gravity: 2.5-2.6

Hardness: 6 on the Mohs scale
Color: Typically pink, salmon-pink, or reddish
Luster: Vitreous to pearly

Identified August 7, 2026More mineral →

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Physical properties

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 mild abrasive in scouring powders. Sometimes cut as a gemstone (such as amazonite or sunstone varieties).

Geological facts

Potassium feldspar is one of the most abundant mineral groups in the Earth's crust, making up about 12% of the crust by volume.

Field identification & locations

Easily identified in the field by its distinct pink to salmon color, blocky crystal form, and right-angle cleavage planes. Found worldwide in granitic terrains.