mineral

Polished brown jasper or hematite-rich ironstone heart

Microcrystalline quartz (SiO₂), likely colored by iron oxides; exact identification requires testing

AI-generated identification · may be incorrect

Opaque reddish-brown to dark brown, polished vitreous-to-waxy luster, no visible cleavage, and likely Mohs hardness about 6.5–7 if jasper; hematite-rich material may be softer or heavier.

Identified September 5, 2026More mineral →

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At a glance

Common name: Polished brown jasper or hematite-rich ironstone heart
Scientific name: Microcrystalline quartz (SiO₂), likely colored by iron oxides; exact identification requires testing
Category: mineral
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Typically $5–$25 for a small polished heart; higher-quality patterned or unusually heavy specimens may reach $30–$75.

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

Opaque reddish-brown to dark brown, polished vitreous-to-waxy luster, no visible cleavage, and likely Mohs hardness about 6.5–7 if jasper; hematite-rich material may be softer or heavier.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material, with iron oxides producing the brown-red color; formation ages vary widely by deposit.

Uses & applications

Commonly carved and polished for cabochons, hearts, ornaments, and inexpensive jewelry; valued mainly as a decorative lapidary material.

Geological facts

The heart shape and glossy surface indicate human cutting and polishing, but the underlying material is still geological. A strong streak or density test can help distinguish hematite-rich stone from jasper.

Field identification & locations

Common sources include India, Brazil, Madagascar, Australia, and the western United States. Check for a white streak and glass-scratching hardness; hematite gives a red-brown streak and is unusually heavy.