mineral

Tumbled amethyst

Quartz (SiO₂), purple variety known as amethyst

AI-generated identification · may be incorrect

Mohs hardness 7; translucent purple and white, vitreous luster, trigonal crystal structure, and no cleavage. The rounded shape indicates it has been mechanically tumbled and polished.

Identified October 13, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent purple and white, vitreous luster, trigonal crystal structure, and no cleavage. The rounded shape indicates it has been mechanically tumbled and polished.

Formation & geological history

Amethyst forms as silica-rich fluids deposit quartz in cavities, commonly in volcanic rocks; its purple color comes from trace iron and natural irradiation. Deposits range in age from ancient to geologically recent.

Uses & applications

Used in jewelry, ornaments, meditation stones, and mineral collections.

Geological facts

Amethyst is the purple variety of quartz; uneven color zoning and white quartz patches are common in tumbled pieces.

Field identification & locations

Identify by its purple color, glassy luster, and hardness; it occurs worldwide, notably in Brazil, Uruguay, and Zambia. This small polished specimen is likely worth about $2–$10 USD.