mineral

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Hardness: 6.0 on Mohs scale; Color: Pinkish-orange to salmon; Luster: Vitreous to pearly; Crystal System: Monoclinic; Cleavage: Two planes at 90 degrees; Specific Gravity: 2.55–2.63

Hardness: 6
Color: Pinkish-orange to salmon
Luster: Vitreous to pearly

Identified April 1, 2026More mineral →

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Physical properties

Hardness: 6.0 on Mohs scale; Color: Pinkish-orange to salmon; Luster: Vitreous to pearly; Crystal System: Monoclinic; Cleavage: Two planes at 90 degrees; Specific Gravity: 2.55–2.63

Formation & geological history

Formed primarily in intrusive igneous rocks such as granite through the cooling of magma. It is one of the most common rock-forming minerals found in the Earth's crust.

Uses & applications

Used in the manufacture of glass and ceramics (as a flux), in abrasive cleaners, and occasionally as a gemstone (moonstone varieties).

Geological facts

Feldspar makes up about 60% of the Earth's outer crust. The name 'Orthoclase' is Greek for 'straight fracture,' referring to its two cleavage planes at right angles.

Field identification & locations

Identify in the field by its distinct pink/salmon color, 90-degree cleavage, and hardness (it will scratch glass but cannot be scratched by a steel nail). Commonly found in mountain ranges and gravel deposits near granitic outcrops.