mineral

Polished/tumbled malachite–chrysocolla specimen (probable)

Malachite Cu2CO3(OH)2 with chrysocolla Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O; possibly minor quartz or limonite

AI-generated identification · may be incorrect

Small polished, opaque copper-mineral aggregate with blue-green to green-brown mottling and subdued vitreous-to-waxy luster. Malachite hardness is 3.5–4 Mohs; chrysocolla is softer, about 2.5–3.5. Crystal structure is typically cryptocrystalline, with no obvious cleavage;…

Identified September 17, 2026More mineral →

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At a glance

Common name: Polished/tumbled malachite–chrysocolla specimen (probable)
Scientific name: Malachite Cu2CO3(OH)2 with chrysocolla Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O; possibly minor quartz or limonite
Category: mineral
Identified: September 17, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small ordinary polished piece; $30–$100+ if vividly patterned, unusually large, or confirmed high-quality malachite/chrysocolla.

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 oxidized zones of copper deposits when copper-bearing fluids react with carbonate and silica-rich host rocks, commonly during the Cenozoic or older weathering episodes. The surface appears human-polished or tumbled.

Uses & applications

Used as ornamental stone, beads, cabochons, carvings, and copper-ore specimens; not generally suitable for durable construction. Avoid prolonged water, acids, and skin contact with dust because copper minerals can be chemically reactive.

Geological facts

The blue-green color combination is characteristic of copper-oxidation minerals, but a photograph cannot reliably distinguish chrysocolla from turquoise, azurite, or dyed jasper.

Field identification & locations

The reported Louisiana location lies in unconsolidated Gulf Coastal Plain sediments, where such material is unlikely to be naturally local; it was probably transported or purchased. Confirm with a streak test, hardness testing, and ideally Raman/XRF analysis; do not use acid on the polished surface.