mineral

Copper-stained rounded stone

Likely copper-bearing chrysocolla or azurite/malachite coating on a silicate host; exact identification requires testing

AI-generated identification · may be incorrect

Brown-gray, rounded, weathered surface with pale blue-green patches and dull to earthy luster. The host may be quartzite, sandstone, or another hard silicate; apparent hardness is roughly 5–7, while copper minerals are softer (about 3–4).

Identified August 15, 2026More mineral →

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At a glance

Common name: Copper-stained rounded stone
Scientific name: Likely copper-bearing chrysocolla or azurite/malachite coating on a silicate host; exact identification requires testing
Category: mineral
Identified: August 15, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as an ordinary cobble; $10–$50 if the blue-green copper mineralization is attractive and confirmed.

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

Probably a naturally weathered cobble coated or veined by secondary copper minerals formed when copper sulfides oxidized near the surface, commonly during the Cenozoic or older weathering episodes.

Uses & applications

Primarily a field or lapidary specimen; attractive pieces may be polished, but this example has limited commercial use and is unlikely to be suitable for jewelry without confirmation and cutting.

Geological facts

Blue-green coloration commonly indicates chrysocolla, azurite, or malachite, but image color alone cannot distinguish them. A streak, hardness, acid, and copper-mineral testing would improve identification.

Field identification & locations

Common in oxidized copper deposits, especially in Arizona, Nevada, New Mexico, Chile, Australia, and parts of Africa. Look for blue-green coatings, copper staining, and association with quartz or iron oxides; avoid assuming it is turquoise without testing.