Adularia
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.0
Specific Gravity
2.54 – 2.61
Refractive Index
1.518 – 1.536
Crystal System
Monoclinic
Color
various
Birefringence
0.005
Mohs Hardness
| Mohs | Reference mineral | Adularia |
|---|---|---|
| 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 Adularia
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 Adularia
Adularia is a transparent to translucent variety of orthoclase feldspar prized for its soft, floating internal light known as adularescence. Originally discovered in the Adular Mountains of Switzerland, it is the variety most closely associated with the classic moonstone optical phenomenon. With a pearly, bluish glow that seems to move across its surface, adularia has been used in jewelry since ancient Rome.
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Adularia?
Adularia is a transparent to translucent variety of orthoclase feldspar prized for its soft, floating internal light known as adularescence. Originally discovered in the Adular Mountains of Switzerland, it is the variety most closely associated with the classic moonstone optical phenomenon. With a p
What is the hardness of Adularia?
Adularia has a Mohs hardness of 6.0, making it moderate for use in jewelry.
What color is Adularia?
Adularia is primarily Various.
How much does Adularia cost?
Adularia falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Adularia?
Adularia belongs to the Monoclinic crystal system.