mineral

Tumbled brown stone, possibly amber or polished agate

Indeterminate from image; possibilities include amber (fossilized plant resin, organic) or chalcedony/quartz (SiO₂)

AI-generated identification · may be incorrect

Small smooth rounded specimen with translucent brown-golden color and subdued waxy luster. If chalcedony, hardness is about 6.5–7 Mohs; amber is much softer at 2–2.5 and may feel unusually light.

Identified August 16, 2026More mineral →

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At a glance

Common name: Tumbled brown stone, possibly amber or polished agate
Scientific name: Indeterminate from image; possibilities include amber (fossilized plant resin, organic) or chalcedony/quartz (SiO₂)
Category: mineral
Identified: August 16, 2026
Method: Standard

AI Estimated Value

About $1–$20 for a common small tumbled stone; attractive natural amber may sell for $10–$100+, while fine specimens can be substantially more.

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

Small smooth rounded specimen with translucent brown-golden color and subdued waxy luster. If chalcedony, hardness is about 6.5–7 Mohs; amber is much softer at 2–2.5 and may feel unusually light.

Formation & geological history

Amber formed from fossilized tree resin, commonly tens of millions of years old; brown chalcedony formed when silica-rich fluids filled cavities, usually in volcanic rocks. The image lacks diagnostic detail for a confident identification.

Uses & applications

Amber is used in jewelry and collecting; chalcedony is used for cabochons, beads, carvings, and ornamental objects. Value depends strongly on transparency, inclusions, size, and treatment.

Geological facts

Amber can float in saturated salt water, attract lightweight fibers when rubbed, and smell resinous when gently warmed; quartz-based stones will not. A UV lamp may produce fluorescence in some amber, but this test is not definitive.

Field identification & locations

Common amber sources include the Baltic region and the Dominican Republic; chalcedony occurs worldwide. Examine translucency, inclusions, weight, hardness, and streak, avoiding destructive tests on an unknown specimen.