Rock Identifier
Copper-bearing Quartz (with Malachite and Iron Oxides) (Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)) — Mineral Specimen
Mineral Specimen

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Hardness: 7 (quartz matrix), 3.5-4 (malachite staining); Color: Green, blue-green, white, and rusty orange/red; Luster: Vitreous to earthy; Crystal structure: Trigonal/Monoclinic; Specific Gravity: Approx 2.65-4.0 depending on metal concentration.

Hardness
7 (quartz matrix), 3
Color
Green, blue-green, white, and rusty orange/red
Luster
Vitreous to earthy
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Physical properties

Hardness: 7 (quartz matrix), 3.5-4 (malachite staining); Color: Green, blue-green, white, and rusty orange/red; Luster: Vitreous to earthy; Crystal structure: Trigonal/Monoclinic; Specific Gravity: Approx 2.65-4.0 depending on metal concentration.

Formation & geological history

Formed in the secondary oxidation zones of copper-rich hydrothermal veins. Rainwater and groundwater react with primary copper minerals, leaching them and redepositing them as colorful coatings or stains within a quartz or host rock matrix.

Uses & applications

Primarily used as an indicator for copper mining (ore prospecting) and as decorative lapidary material or mineral specimens for collectors.

Geological facts

This specimen shows 'gossan' characteristics—the rusty orange caps formed by the oxidation of sulfide minerals. Geologists use these colorful exposures as signs that a richer ore body may lie deep underground.

Field identification & locations

Identify in the field by the distinct blue-green (copper) and rusty red (iron) alteration colors against a white/grey rock. Look for it in arid regions near historic copper mines. It will not react with HCl unless significant carbonate is present.

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Mixed Mineral Specimens

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