Chalcopyrite

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Physical & Optical Properties

Mohs Hardness 3,5 – 4,0
Specific Gravity 4,1 – 4,3
Crystal System Tetragonal
Luster Metallic
Cleavage Poor
Color various

Mohs Hardness

Mohs Hardness: 3,5 – 4,0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

About Chalcopyrite

Chalcopyrite is a brassy yellow copper iron sulfide—the most important copper ore mineral—that develops a gorgeous iridescent tarnish of purple, blue, gold, and red when its surface weathers, a phenomenon called chalcopyrite peacock ore. This vivid interference coloring on natural or acid-treated specimens makes it extremely popular as a decorative and collector mineral. Despite its brilliant surface display, raw chalcopyrite is too soft and reactive for use as a cut gem.

Jewelry Use

Durability 2/10

Science FYI Family

Frequently Asked Questions

What is Chalcopyrite?
Chalcopyrite is a brassy yellow copper iron sulfide—the most important copper ore mineral—that develops a gorgeous iridescent tarnish of purple, blue, gold, and red when its surface weathers, a phenomenon called chalcopyrite peacock ore. This vivid interference coloring on natural or acid-treated sp
What is the hardness of Chalcopyrite?
Chalcopyrite has a Mohs hardness of 3.5 to 4.0, making it relatively soft for use in jewelry.
What color is Chalcopyrite?
Chalcopyrite is primarily Various.
How much does Chalcopyrite cost?
Chalcopyrite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Chalcopyrite?
Chalcopyrite belongs to the Tetragonal crystal system.

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