mineral

Polished brown stone, likely smoky quartz or jasper

Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing

AI-generated identification · may be incorrect

Smooth tumbled form with brown color and vitreous-to-waxy luster; quartz hardness is 7, no obvious cleavage, and conchoidal fracture. The image alone cannot distinguish quartz from brown jasper, agate, or glass.

Identified August 11, 2026More mineral →

Explore Polished brown stone, likely smoky quartz or jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Polished brown stone, likely smoky quartz or jasper
Scientific name: Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Approximately $1-$10 for a common tumbled stone; $10-$30 if unusually clear, attractive, or confirmed as quality smoky quartz.

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

If quartz, it formed from silica-rich hydrothermal fluids or igneous rocks, commonly in veins and cavities; smoky color results from radiation-activated defects. Geological age depends on its host deposit.

Uses & applications

Used as a decorative tumbled stone, lapidary material, jewelry, and collector specimen; common pieces have modest value.

Geological facts

The adjacent crumpled object appears to be paper, while the brown rounded object is the geological specimen. A glassy appearance and ability to scratch ordinary steel would support quartz, but glass can look similar.

Field identification & locations

Common sources include Brazil, Madagascar, the United States, and Uruguay. Check hardness, streak (quartz leaves little or no streak), translucency, and internal banding; avoid confidently identifying it without these tests.