mineral

Tumbled blue stone and polished red-brown stone

Likely sodalite or blue aventurine; red specimen possibly jasper or polished flint/chert

AI-generated identification · may be incorrect

The left stone is opaque blue-gray with darker mottling and a vitreous-to-waxy luster; likely Mohs 5.5–7. The right is red-brown, fine-grained, and waxy, likely Mohs 6.5–7; exact identification requires testing or a clearer image.

Identified September 4, 2026More mineral →

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At a glance

Common name: Tumbled blue stone and polished red-brown stone
Scientific name: Likely sodalite or blue aventurine; red specimen possibly jasper or polished flint/chert
Category: mineral
Identified: September 4, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 each as common tumbled or polished specimens; unusual color, pattern, or verified provenance may raise value to $20–$50.

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

Sodalite forms in alkaline igneous rocks; aventurine is quartz-rich and metamorphic or hydrothermal. Jasper and chert form from silica-rich sedimentary or volcanic processes, generally from Precambrian to younger ages.

Uses & applications

Used as inexpensive cabochons, beads, tumbled stones, ornaments, and decorative objects; jasper and chert are also used for carvings and occasionally construction aggregate.

Geological facts

The blue stone’s color and texture are consistent with sodalite, but lapis lazuli, dyed quartz, or blue calcite are alternatives. The red stone may be jasper, brecciated jasper, or flint.

Field identification & locations

Check streak, hardness, translucency, and acid reaction: quartz-rich material scratches glass and leaves a white streak; sodalite is softer and typically has a white streak. Common sources include Canada, Brazil, India, and the United States.