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.

Kristal Sistemi Monoclinic
Mineral Sınıfı 09 Silicates
Mohs Sertliği 6.0-6.5
Özgül Ağırlık 2.55-2.63
Renk White, pink, cream, gray
Parlaklık Vitreous
Çizgi Rengi White
Dilimlenme Perfect {001}, good {010}
Kırılma Uneven to conchoidal
Şeffaflık Translucent
Kristal Alışkanlığı Prismatic, tabular

Mohs Sertliği

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.
Mohs Sertliği Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Kristal Sistemi

Monoclinic
Feldspar (Orthoclase) crystallizes in the Monoclinic crystal system.
Özellik Value
Kristal Sistemi 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.