mineral

Tumbled brown mineral/rock specimen

Indeterminate from image; likely brown jasper, chert, or iron-stained quartzite

AI-generated identification · may be incorrect

Opaque brown to dark brown, smooth rounded surface, dull-to-waxy luster, and no visible crystals or cleavage. Likely hardness about 6–7 Mohs if jasper/chert/quartzite; specific gravity approximately 2.6–2.7.

Identified September 4, 2026More mineral →

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At a glance

Common name: Tumbled brown mineral/rock specimen
Scientific name: Indeterminate from image; likely brown jasper, chert, or iron-stained quartzite
Category: mineral
Identified: September 4, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as a common tumbled specimen; potentially $10–$30 if it proves to be attractive, high-quality jasper or a distinctive local 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

Probably a naturally weathered and/or tumbled siliceous pebble, formed from microcrystalline quartz or quartz-rich rock; age and exact formation environment cannot be determined visually.

Uses & applications

Used as a decorative pebble, lapidary material, worry stone, or inexpensive cabochon; not typically used structurally because of its small size.

Geological facts

The elongated shape and uniformly polished surface suggest human tumbling or prolonged water abrasion. Brown coloration commonly comes from iron oxides and hydroxides.

Field identification & locations

Test identification with a streak, hardness test, and strong light: jasper/chert generally scratches glass and leaves a white streak, while softer brown rocks may not. Commonly found in river gravels and sedimentary terrains.