mineral

Copper-bearing oxidized rock

Likely malachite–chrysocolla with limonite/goethite in a weathered host rock; exact identification requires testing

AI-generated identification · may be incorrect

Pale blue-green, turquoise-green, yellow-brown, and gray mottling with earthy to dull luster, porous texture, and no obvious crystal faces. Malachite has Mohs hardness 3.5–4; chrysocolla 2.5–3.5; limonite is variable and earthy. Copper staining is suggested, but color alone is not diagnostic.

Identified September 11, 2026More mineral →

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At a glance

Common name: Copper-bearing oxidized rock
Scientific name: Likely malachite–chrysocolla with limonite/goethite in a weathered host rock; exact identification requires testing
Category: mineral
Identified: September 11, 2026
Method: Standard

AI Estimated Value

Approximately $2–$20 as a rough collector specimen; attractive polished or strongly patterned material may sell for $20–$100+, while this irregular piece appears toward the low end.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms in the oxidized zone above copper sulfide deposits, where groundwater alters copper minerals into secondary carbonates and hydrated copper silicates. Usually Cenozoic or older depending on the host ore deposit.

Uses & applications

Specimens may be collected or cut for decorative material; malachite and chrysocolla are used in cabochons and ornaments. Copper ores are mined industrially, though this porous piece may have little ore value.

Geological facts

Malachite commonly shows vivid green banding, while chrysocolla is more blue-green and often mixed with quartz, limonite, or host rock. Effervescence in dilute hydrochloric acid supports malachite, but avoid acids if preservation matters.

Field identification & locations

Common around weathered copper deposits worldwide, including Arizona, the Democratic Republic of Congo, Zambia, Australia, and parts of South America. Check for a green streak, copper-colored metal, hardness, and acid reaction; laboratory analysis is needed for certainty.