mineral

Tumbled brown translucent stone, likely quartz/jasper

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony or jasper

AI-generated identification · may be incorrect

Smooth, rounded, brown to reddish-brown, with a waxy-to-dull luster and apparent slight translucency. Quartz hardness is Mohs 7; no visible cleavage, conchoidal fracture, and specific gravity about 2.6.

Identified August 11, 2026More mineral →

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At a glance

Common name: Tumbled brown translucent stone, likely quartz/jasper
Scientific name: Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony or jasper
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 for a small tumbled stone; approximately $10-$30 if unusually attractive, patterned, or sold as a verified collectible variety.

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

Formed when silica-rich fluids deposited or replaced material in rock cavities and fractures; iron oxides produced the brown-red coloration. The specimen has been mechanically tumbled and polished, so its precise geological age and source cannot be determined visually.

Uses & applications

Used as an inexpensive decorative stone, lapidary material, cabochons, beads, and educational specimens; jasper is also used for ornaments and small carvings.

Geological facts

The appearance is consistent with brown jasper, iron-stained chalcedony, or less commonly a quartz-rich breccia. A scratch test against ordinary steel or glass can help assess quartz-like hardness, though it may damage the polish.

Field identification & locations

Commonly found in silica-rich volcanic and sedimentary environments worldwide, including Brazil, India, Madagascar, Uruguay, and the western United States. Exact identification requires translucency, streak, and possibly microscopic or chemical testing.