Feldspar (Orthoclase)

KAlSi3O8

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Orthoclase, a potassium feldspar with the formula KAlSi3O8, ranks among the most abundant minerals in the Earth's crust and is an essential component of granite and many other igneous rocks. It crystallizes in the monoclinic system as prismatic or tabular crystals, showing a vitreous luster, a white streak, and perfect {001} cleavage. Colors include white, pink, cream, and gray, with a Mohs hardness of 6 to 6.5 and a specific gravity between 2.55 and 2.63. Moonstone, valued for its floating adularescent sheen, is a gem variety of orthoclase. Its uneven to conchoidal fracture and two good cleavage directions are typical of the feldspar group.

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.

Système Cristallin Monoclinic
Classe Minérale 09 Silicates
Dureté Mohs 6.0-6.5
Densité 2.55-2.63
Couleur White, pink, cream, gray
Éclat Vitreous
Trait White
Clivage Perfect {001}, good {010}
Cassure Uneven to conchoidal
Transparence Translucent
Habitus Cristallin Prismatic, tabular

Dureté Mohs

Mohs Hardness: 6,0 – 6,5
1 Soft10 Hard
Feldspar (Orthoclase) has a Mohs hardness of 6–6.5 on the 1–10 mineral hardness scale.
Dureté Mohs Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Système Cristallin

Monoclinic
Feldspar (Orthoclase) crystallizes in the Monoclinic crystal system.
Propriété Value
Système Cristallin Monoclinic
Axial Relationships a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

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.