Afghanite

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Physical & Optical Properties

Mohs Hardness 5.5 – 6.0
Specific Gravity 2.55 – 2.65
Refractive Index 1.522 – 1.533
Crystal System Hexagonal
Luster Vitreous
Cleavage Perfect
Fracture Conchoidal
Color various
Birefringence 0.006

Mohs Hardness

Mohs Hardness: 5.5 – 6.0
1 Soft10 Hard

Crystal System

a a c Hexagonal a = b ≠ c, α = β = 90°, γ = 120°

Value & Market

Price Tier Budget (< $50/ct)

About Afghanite

Afghanite is a rare, bright blue to colorless tectosilicate mineral found almost exclusively in the Koksha Valley of Afghanistan, where it occurs alongside lazurite in marble. Its intense sky-blue color rivals lapis lazuli and makes gem-quality crystals among the most sought-after collector specimens from the region. Faceted examples are exceedingly rare, found only in specialized gemological collections.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Afghanite?
Afghanite is a rare, bright blue to colorless tectosilicate mineral found almost exclusively in the Koksha Valley of Afghanistan, where it occurs alongside lazurite in marble. Its intense sky-blue color rivals lapis lazuli and makes gem-quality crystals among the most sought-after collector specimen
What is the hardness of Afghanite?
Afghanite has a Mohs hardness of 5.5 to 6.0, making it moderate for use in jewelry.
What color is Afghanite?
Afghanite is primarily Various.
How much does Afghanite cost?
Afghanite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Afghanite?
Afghanite belongs to the Hexagonal crystal system.

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