Feldspar
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.0 – 6.5
Specific Gravity
2.56 – 2.75
Refractive Index
1.518 – 1.57
Cleavage
Perfect
Fracture
Uneven,Conchoidal,Splintery
Color
various
Birefringence
0.008
Mohs Hardness
| Mohs | Reference mineral | Feldspar |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Feldspar
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 Feldspar
フェルスパー（長石）は、地球の地殻中で最も豊富な鉱物グループで、宝石としてはムーンストーン・サンストーン・ラブラドライト・アマゾナイトなど多くの種類があります。アルカリ長石や斜長石などに分類され、アデュラレッセンス（月長石の光彩）やラブラドレッセンス（虹彩効果）など独特の光学現象を示します。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Feldspar?
フェルスパー（長石）は、地球の地殻中で最も豊富な鉱物グループで、宝石としてはムーンストーン・サンストーン・ラブラドライト・アマゾナイトなど多くの種類があります。アルカリ長石や斜長石などに分類され、アデュラレッセンス（月長石の光彩）やラブラドレッセンス（虹彩効果）など独特の光学現象を示します。
What is the hardness of Feldspar?
Feldspar has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Feldspar?
Feldspar is primarily Various.
How much does Feldspar cost?
Feldspar falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
How do you care for Feldspar?
Feldspar is moderately durable and best suited for earrings, pendants, and brooches. Avoid ultrasonic cleaners and harsh chemicals.