gemstone

Chrysocolla in Jasper / Green Jasper

Cu2-xAlx(H2-x)Si2O5(OH)4·nH2O in SiO2 matrix

AI-generated identification · may be incorrect

Hardness: 6.5–7 on the Mohs scale (due to silicification/chalcedony); Color: Mottled forest green, lime green, and teal-blue patches; Luster: Vitreous to waxy when polished; Crystal structure: Microcrystalline (cryptocrystalline); Specific gravity: ~2.6–2.8

Hardness: 6
Color: Mottled forest green, lime green, and teal-blue patches
Luster: Vitreous to waxy when polished

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Formed in the oxidation zones of copper ore deposits where copper-rich fluids intermingle with and become silicified by silica-rich hydrothermal solutions or groundwater, creating a tough, siliceous composite rock often termed 'chrysocolla jasper' or 'chrysocolla agate'.

Uses & applications

Predominantly used as an ornamental carving stone, lapidary material for polished eggs, spheres, beads, and cabochons in jewelry.

Geological facts

Natural chrysocolla alone is relatively soft (Mohs 2.5–3.5), but when fully permeated with quartz or chalcedony, it becomes durable enough to withstand high polish and daily jewelry wear without scratching easily.

Field identification & locations

Recognized by its distinctive composite green and teal mosaic-like pattern with chalcedonic hardness. Notable localities include copper-rich deposits in Peru, Chile, the DRC, Mexico, and Arizona, USA.