mineral

Tumbled yellow-brown quartz-rich stone (possibly jasper or iron-stained quartz)

Microcrystalline quartz, SiO₂, likely chalcedony/jasper with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque yellow-brown color, earthy to dull/waxy luster, and no obvious cleavage. The rounded, polished shape indicates human tumbling; internal banding or veining is faintly visible.

Identified August 22, 2026More mineral →

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At a glance

Common name: Tumbled yellow-brown quartz-rich stone (possibly jasper or iron-stained quartz)
Scientific name: Microcrystalline quartz, SiO₂, likely chalcedony/jasper with iron-oxide staining
Category: mineral
Identified: August 22, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common tumbled piece; $15–$50 if it has unusually attractive patterning or confirmed provenance.

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

Quartz-rich material formed from silica-rich fluids filling fractures or replacing rock, with iron oxides producing the brown-yellow coloration. Exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a lapidary stone for cabochons, carvings, tumbled stones, and decorative objects; generally modest collector value.

Geological facts

Jasper is an opaque variety of chalcedony, while iron-stained quartz can look similar; a glassy fracture and resistance to scratching help distinguish quartz-rich material from softer calcite.

Field identification & locations

Commonly found in volcanic and sedimentary terrains worldwide, including Brazil, India, Madagascar, the United States, and Australia. A steel file should not easily scratch it; acid testing and a close view of translucency can help separate it from calcite or dyed material.