gemstone

Mixed polished gemstones and minerals

Likely agate/chalcedony (SiO₂), quartz, jasper, and possibly aventurine or obsidian; exact identification requires individual testing.

AI-generated identification · may be incorrect

Small tumbled and polished stones with vitreous to waxy luster, mostly translucent brown, orange, gray, black, and yellow colors; quartz varieties have Mohs hardness 7, while agate/chalcedony are microcrystalline quartz with no visible cleavage.

Identified August 28, 2026More gemstone →

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At a glance

Common name: Mixed polished gemstones and minerals
Scientific name: Likely agate/chalcedony (SiO₂), quartz, jasper, and possibly aventurine or obsidian; exact identification requires individual testing.
Category: gemstone
Identified: August 28, 2026
Method: Standard

AI Estimated Value

About $5–$30 for the pictured mixed box; individual attractive polished stones commonly sell for $1–$15.

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

These are likely natural silicate minerals formed in volcanic cavities, hydrothermal veins, or silica-rich sedimentary settings, generally ranging from Precambrian to Cenozoic age depending on locality.

Uses & applications

Used for jewelry, cabochons, crafts, décor, lapidary practice, and teaching collections; commercial value is usually modest for mixed tumbled assortments.

Geological facts

Orange and banded pieces may be carnelian or agate, translucent brown pieces may be smoky quartz or jasper, and dark glossy pieces may be obsidian; photographs alone cannot reliably separate them.

Field identification & locations

Identify by hardness, streak, transparency, banding, cleavage, and specific gravity: quartz scratches glass and has white streak, while obsidian is softer and glassy. Common sources include Brazil, Uruguay, Madagascar, India, Mexico, and the United States.