mineral

Chrysocolla in Chalcedony (Gem Silica / Chrysocolla Jasper)

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O mixed with Quartz/Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness: 2.5–7 (depending on quartz/chalcedony content; silicified forms reach 6.5–7); Color: mottled shades of forest green, cyan, blue-green, and yellowish-green; Luster: vitreous to waxy when polished; Crystal structure: orthorhombic (microcrystalline/cryptocrystalline); Specific gravity: approx.…

Hardness: 2
Luster: vitreous to waxy when polished

Identified October 3, 2026More mineral →

Explore Chrysocolla in Chalcedony (Gem Silica / Chrysocolla Jasper) in the encyclopedia →

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Physical properties

Formation & geological history

Formed as a secondary copper mineral in the oxidation zones of copper-rich porphyry ore bodies, often intergrown or replaced by silica (chalcedony/quartz) through hydrothermal fluids circulating through fractures.

Uses & applications

Commonly carved and polished into decorative shapes such as eggs, spheres, and cabochons for jewelry, ornamental display, and metaphysical use.

Geological facts

When heavily infused with microcrystalline quartz, it is known in the gemstone trade as 'gem silica' and is the most valuable variety of chalcedony. The name 'chrysocolla' originates from the Greek words 'chrysos' (gold) and 'kolla' (glue), referencing its ancient use as a flux in soldering gold.

Field identification & locations

Identifiable by its rich teal-to-forest green mottled patterns, presence of secondary copper mineral coloration, and resistance to scratches when silicified. Major deposits are found in Arizona (USA), Peru, Chile, the Democratic Republic of the Congo, and Mexico.