Dumortierite
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
7.0 – 8.5
Specific Gravity
3.26 – 3.41
Refractive Index
1.669 – 1.723
Crystal System
Orthorhombic
Luster
Vitreous
Cleavage
Good
Fracture
Conchoidal
Color
various
Birefringence
0.011
Pleochroism
Strong trichroism for rare red-brown crystals: black - red brown - brown
Mohs Hardness
| Mohs | Reference mineral | Dumortierite |
|---|---|---|
| 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 Dumortierite
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 Dumortierite
デュモルティエライトは、アルミニウムホウ珪酸塩鉱物で、鮮やかな青紫色から赤紫色を示します。フランスの鉱物学者デュモルティエに因んで命名されました。塊状や繊維状で産出し、カボションカットに仕上げられることが多く、ネバダ州やフランスが主要産地です。彫刻品や装飾品にも利用されます。
On this page
Jewelry Use
Durability
7/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Dumortierite?
デュモルティエライトは、アルミニウムホウ珪酸塩鉱物で、鮮やかな青紫色から赤紫色を示します。フランスの鉱物学者デュモルティエに因んで命名されました。塊状や繊維状で産出し、カボションカットに仕上げられることが多く、ネバダ州やフランスが主要産地です。彫刻品や装飾品にも利用されます。
What is the hardness of Dumortierite?
Dumortierite has a Mohs hardness of 7.0 to 8.5, making it excellent for use in jewelry.
What color is Dumortierite?
Dumortierite is primarily Various.
How much does Dumortierite cost?
Dumortierite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Dumortierite?
Dumortierite belongs to the Orthorhombic crystal system.