mineral

Polished malachite–agate breccia (likely)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining; exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; cream, brown, rust-red, and dark chocolate banding with a waxy to glossy polish. Cryptocrystalline quartz has no visible cleavage and typically has specific gravity near 2.6; the specimen appears cut and highly polished.

Identified September 10, 2026More mineral →

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At a glance

Common name: Polished malachite–agate breccia (likely)
Scientific name: Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining; exact identification requires testing
Category: mineral
Identified: September 10, 2026
Method: Standard

AI Estimated Value

Approximately $15–$100 for a small polished specimen; unusually large, vividly patterned pieces may reach $150–$300.

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

Silica-rich groundwater deposited chalcedony and quartz in cavities or fractures, while iron oxides produced the red-brown colors; later cutting and polishing exposed the ornamental patterns. The precise geological age cannot be determined visually and depends on locality.

Uses & applications

Used as a decorative lapidary specimen, paperweight, cabochon, or display stone; patterned pieces are collectible rather than major industrial material.

Geological facts

The intricate concentric and flowing patterns are characteristic of chalcedony/agate, though the dark red-brown areas may include jasper or hematite-rich material. The image does not show diagnostic green malachite coloration, so “malachite” should be confirmed chemically.

Field identification & locations

Identify by its glassy/waxy polish, very fine banding, lack of cleavage, and resistance to scratching by steel; quartz should scratch glass. Common agate sources include Brazil, Uruguay, Mexico, Madagascar, and the western United States.