gemstone

Tumbled amethyst (likely)

Quartz, SiO₂; purple coloration is typically caused by trace iron and natural irradiation

AI-generated identification · may be incorrect

Small, polished, translucent-to-opaque purple stone with a pale band or inclusion; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure. The photo does not show enough detail to confirm the identification.

Identified October 15, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms as quartz crystals in mineral-rich fluids within cavities of volcanic rocks, commonly basalt; deposits range from ancient to geologically recent.

Uses & applications

Used in jewelry, carvings, decorative objects, and mineral collections.

Geological facts

Amethyst is the purple variety of quartz; color intensity and zoning vary with iron content and irradiation.

Field identification & locations

Check for glassy luster, hardness near 7, and natural color zoning; common sources include Brazil, Uruguay, and Zambia. A single small tumbled piece is typically worth about $1–$10 USD.