Anorthoclase
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Physical & Optical Properties
Category
Semi-Precious Gems
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 | Reference mineral | Anorthoclase |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Anorthoclase
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
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.
On this page
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.