mineral

Dark brown tumbled stone, likely smoky quartz or polished jasper

Uncertain from image; possible quartz, SiO₂, or iron-rich microcrystalline silica (jasper)

AI-generated identification · may be incorrect

Glossy wet-looking surface, opaque to slightly translucent edges, dark brown color, and rounded tumbler polish. Quartz has Mohs hardness 7 and vitreous luster; jasper has hardness about 6.5–7, no visible cleavage, and conchoidal fracture.

Identified August 16, 2026More mineral →

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At a glance

Common name: Dark brown tumbled stone, likely smoky quartz or polished jasper
Scientific name: Uncertain from image; possible quartz, SiO₂, or iron-rich microcrystalline silica (jasper)
Category: mineral
Identified: August 16, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled stone; $10–$50 for an unusually large, attractive, or well-identified specimen.

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 forms in silica-rich igneous or hydrothermal environments, while jasper forms from silica-rich sediment or volcanic fluids; ages vary widely from Precambrian to recent. The specimen has been mechanically tumbled and polished.

Uses & applications

Used as a decorative stone, cabochon, lapidary material, or collectible; not generally used for construction in this form.

Geological facts

The image alone cannot reliably distinguish smoky quartz from opaque brown jasper, agate, or glass. A translucent edge, conchoidal fracture, and scratch resistance help identify quartz varieties.

Field identification & locations

Common sources include Brazil, Madagascar, the United States, Uruguay, and India. Check for bubbles or uniform swirls suggesting glass; quartz should scratch ordinary glass, while jasper is typically opaque and granular.