igneous or metamorphic

Tumbled brown stone, likely basalt or iron-stained quartzite

Indeterminate from photograph; possible basalt (mafic silicate rock) or quartzite (SiO₂)

AI-generated identification · may be incorrect

Dark brown, rounded and polished/weathered, with dull to slightly granular luster and scattered pale mineral grains; hardness is likely ~5.5–7 Mohs, but texture and cleavage are not diagnostic visually.

Identified September 5, 2026More igneous or metamorphic →

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At a glance

Common name: Tumbled brown stone, likely basalt or iron-stained quartzite
Scientific name: Indeterminate from photograph; possible basalt (mafic silicate rock) or quartzite (SiO₂)
Category: igneous or metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common tumbled or found specimen; potentially higher only if testing confirms an attractive, rare, or gem-quality material.

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

The rounded shape indicates stream abrasion or tumbling; basalt forms from cooled lava, whereas quartzite forms when sandstone is metamorphosed. Age and locality cannot be determined from the image.

Uses & applications

Common material for landscaping, educational specimens, lapidary work, and inexpensive polished stones; unlikely to have significant jewelry value without confirmed composition.

Geological facts

The small pale flecks may be feldspar, quartz, or weathered alteration minerals; a darker brown surface can result from iron-oxide staining or weathering.

Field identification & locations

Test hardness against glass, inspect a fresh break, and use a magnet, streak, acid, and specific-gravity tests; definitive identification requires these tests or microscopy. Similar stones occur widely in river gravels and glacial deposits.