Feldspar (Orthoclase)

KAlSi3O8

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Orthoclase is a potassium feldspar and one of the most common minerals in the Earth's crust. It is an essential component of granite and many other igneous rocks. Moonstone is a gem variety of orthoclase.

Crystal System Monoclinic
Mineral Class 09 Silicates
Mohs Hardness 6.0-6.5
Specific Gravity 2.55-2.63
Color White, pink, cream, gray
Luster Vitreous
Streak White
Cleavage Perfect {001}, good {010}
Fracture Uneven to conchoidal
Transparency Translucent
Crystal Habit Prismatic, tabular

Mohs Hardness

Mohs Hardness: 6.0 – 6.5
1 Soft10 Hard

Crystal System

Monoclinic

Frequently Asked Questions

What is the hardness of Feldspar (Orthoclase)?
Feldspar (Orthoclase) has a Mohs hardness of 6.0-6.5.
What crystal system does Feldspar (Orthoclase) belong to?
Feldspar (Orthoclase) crystallizes in the Monoclinic crystal system.
What color is Feldspar (Orthoclase)?
Feldspar (Orthoclase) is typically White, pink, cream, gray.
What type of luster does Feldspar (Orthoclase) have?
Feldspar (Orthoclase) exhibits a Vitreous luster.
What is the chemical formula of Feldspar (Orthoclase)?
The chemical formula of Feldspar (Orthoclase) is KAlSi3O8.