Cuprite

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Physical & Optical Properties

Mohs Hardness 3.5 – 4.0
Specific Gravity 5.85 – 6.15
Refractive Index 2.849
Crystal System Isometric
Luster Metallic
Cleavage Distinct
Fracture Uneven
Color various

Mohs Hardness

Mohs Hardness: 3.5 – 4.0
1 Soft10 Hard

Crystal System

Value & Market

Price Tier Budget (< $50/ct)

About Cuprite

Cuprite is a vivid red copper oxide mineral forming deep ruby-red to almost black isometric crystals with an extremely high refractive index and adamantine luster, producing faceted gems of extraordinary brilliance—sometimes called 'ruby copper.' Fine transparent crystals and the variety 'chalcotrichite' (hair-like crystal growths) come primarily from Namibia's Onganja Mine and Chessy, France. Despite its optical magnificence, extreme softness (hardness 3.5–4) limits its use to protected collector gems.

Jewelry Use

Durability 2/10

Science FYI Family

Frequently Asked Questions

What is Cuprite?
Cuprite is a vivid red copper oxide mineral forming deep ruby-red to almost black isometric crystals with an extremely high refractive index and adamantine luster, producing faceted gems of extraordinary brilliance—sometimes called 'ruby copper.' Fine transparent crystals and the variety 'chalcotric
What is the hardness of Cuprite?
Cuprite has a Mohs hardness of 3.5 to 4.0, making it relatively soft for use in jewelry.
What color is Cuprite?
Cuprite is primarily Various.
How much does Cuprite cost?
Cuprite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Cuprite?
Cuprite belongs to the Isometric crystal system.

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