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.

アルカリ長石で、アルカリ花崗岩の主成分である。白色から肌色で、完全な二面劈開を持つ。

晶系 Monoclinic
鉱物分類 09 Silicates
モース硬度 6.0-6.5
比重 2.55-2.63
色 White, pink, cream, gray
光沢 Vitreous
条痕色 White
劈開 Perfect {001}, good {010}
断口 Uneven to conchoidal
透明度 Translucent
結晶習性 Prismatic, tabular

モース硬度

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.
モース硬度 Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

晶系

Monoclinic
Feldspar (Orthoclase) crystallizes in the Monoclinic crystal system.
特性 Value
晶系 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.