mineral

Tumbled brown stone, likely smoky quartz or brown jasper

Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty

AI-generated identification · may be incorrect

Smooth, rounded, dark brown, and weakly lustrous, consistent with a polished/tumbled specimen. Quartz has Mohs hardness 7, vitreous luster, conchoidal fracture, and no cleavage; jasper is similarly hard but opaque and microcrystalline.

Identified August 9, 2026More mineral →

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At a glance

Common name: Tumbled brown stone, likely smoky quartz or brown jasper
Scientific name: Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty
Category: mineral
Identified: August 9, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled stone; $10–$30 if unusually large, transparent, or attractively patterned.

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

Smoky quartz crystallizes in silica-rich hydrothermal veins or igneous cavities, commonly through radioactive color centers; jasper forms when silica-rich fluids replace or cement sediments. Ages range from recent vein formation to Precambrian host rocks.

Uses & applications

Small tumbled pieces are used for lapidary collections, jewelry, décor, and metaphysical marketing; they have little industrial or construction use.

Geological facts

A scratch test, translucency check, and streak test can distinguish the possibilities: quartz may be translucent and scratches glass, while jasper is usually fully opaque and leaves a white streak.

Field identification & locations

Common sources include Brazil, Madagascar, the United States, and Uruguay. Confirm identification with hardness, flashlight translucency, and specific gravity; avoid damaging valuable pieces with aggressive tests.