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Cuprite

Curated by Maggie Liu · Updated:

Crystal system · Isometric

Cuprite is an oxide mineral recognized among collectors for its crystal form and distribution, with several world-class Chinese localities.

Cuprite specimen
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About Cupriteextended article

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China is a defining locality for Cuprite · 赤铜矿. See the Chinese collector page →

Crystal system
Isometric (Cubic)

Cuprite is the principal copper(I) oxide mineral and one of the richest Cu ores by mass. Its deep ruby-red color and adamantine luster make it one of the most chromatically striking sulfide-zone collector minerals.

Occurrence in China

Cuprite occurs in the oxidized zones of Tonglushan/Daye (Hubei), Tongling (Anhui), Dexing (Jiangxi) and Yunnan Cu deposits. Large, well-formed cuprite specimens are documented from Mashamba West (Democratic Republic of Congo), Onganja (Namibia), and Bisbee (Arizona).

Identification

Ruby-red translucent cubes/octahedra + adamantine luster + brownish-red streak + association with native copper, malachite, azurite. Distinguish from zincite (hexagonal, orange-red streak) and pyrargyrite (trigonal, lower density).

Collector Notes

Gem-cut cuprite is a connoisseur micro-gem (high RI ~2.85, very soft so collector-only). Crystallized cubes on copper matrix are highly prized — especially “chalcotrichite” hair-like cuprite on copper.

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Published: May 6, 2026 · Last reviewed: May 6, 2026
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About Cuprite

Cuprite is classified as an oxide mineral in the cuprite group and has the chemical formula Cu2O. It crystallizes in the isometric system and is relatively soft, requiring careful handling. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.

Identification & care

Crystals commonly develop as cubic, octahedral, dodecahedral crystals; capillary hair-like wires ('chalcotrichite'); massive; earthy. Its color range is broad, including deep red, crimson, scarlet, and brownish red. The luster is adamantine, sub-metallic, earthy, the streak is shining brownish red, and specimens range from transparent to translucent. The cleavage is imperfect on {111}. The fracture is conchoidal to uneven, which aids identification.

Collector context

How it forms

The geological setting for Cuprite is typically secondary mineral in oxidized zone of copper deposits; often associated with native copper, malachite, azurite. It is commonly found in association with native copper, malachite, azurite, chrysocolla, tenorite, limonite, goethite.

Classic Chinese localities

Jiama Cu-polymetallic deposit and Dexing Cu-Mo-Au ore field are an important Chinese source for the species.

Why collectors care

Cuprite is a frequently-sought species in serious collections because its habit is recognizable, its color often strong, and its best examples unmistakable even at a distance. Chinese material has driven much of the recent visual shift in the species — sharper crystals, deeper colors, cleaner matrix.

What affects value

Value in Cuprite is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.

Frequently asked questions

What is Cuprite?

Cuprite has the chemical formula Cu2O, crystallises in the Isometric system. Cuprite is an oxide mineral recognized among collectors for its crystal form and distribution, with several world-class Chinese localities.

What is the chemical formula of Cuprite?

The chemical formula of Cuprite is Cu2O.

What crystal system does Cuprite belong to?

Cuprite crystallises in the Isometric crystal system.

Where is Cuprite found?

Notable localities for Cuprite include Milpillas Mine, Bisbee, Bisbee.

Related minerals

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