Anorthoclase

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Physical & Optical Properties

Mohs Hardness 6.0 – 6.5
Specific Gravity 2.56 – 2.62
Refractive Index 1.518 – 1.534
Crystal System Monoclinic
Luster Vitreous,Pearly
Fracture Uneven,Conchoidal
Color various
Birefringence 0.006
Pleochroism Weak

Mohs Hardness

Mohs Hardness: 6.0 – 6.5
1 Soft10 Hard

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Anorthoclase

Anorthoclase is a sodium-rich alkali feldspar that can display a beautiful blue to white adularescence, similar to moonstone, caused by light scattering in intergrown lamellae of two feldspar phases. It is found in alkaline igneous rocks, including the famous blue moonstone material from Tanzania which is technically anorthoclase rather than orthoclase. Its silky, floating light makes it a prized cabochon gem in the moonstone category.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Anorthoclase?
Anorthoclase is a sodium-rich alkali feldspar that can display a beautiful blue to white adularescence, similar to moonstone, caused by light scattering in intergrown lamellae of two feldspar phases. It is found in alkaline igneous rocks, including the famous blue moonstone material from Tanzania wh
What is the hardness of Anorthoclase?
Anorthoclase has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Anorthoclase?
Anorthoclase is primarily Various.
How much does Anorthoclase cost?
Anorthoclase falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Anorthoclase?
Anorthoclase belongs to the Monoclinic crystal system.

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