Dumortierite

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Physical & Optical Properties

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 Hardness: 7.0 – 8.5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Dumortierite

Dumortierite is a blue to violet aluminum borosilicate mineral typically found in massive, fibrous form in high-grade metamorphic rocks, valued as a medium-blue to violet cabochon and carving material. Named after the French paleontologist Eugène Dumortier, fine massive material comes from Nevada, California, France, and Mozambique. Though rarely transparent enough to facet, massive dumortierite polishes to a handsome medium blue that makes it popular in beads and decorative carvings.

Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Dumortierite?
Dumortierite is a blue to violet aluminum borosilicate mineral typically found in massive, fibrous form in high-grade metamorphic rocks, valued as a medium-blue to violet cabochon and carving material. Named after the French paleontologist Eugène Dumortier, fine massive material comes from Nevada, C
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.

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