gemstone

Amethyst (polished/tumbled pieces)

Quartz, SiO₂; purple color from trace iron and natural irradiation

AI-generated identification · may be incorrect

Mohs hardness 7; translucent purple to violet, vitreous luster, trigonal crystal structure, and no cleavage (conchoidal fracture). The image shows small polished pieces, though the brownish piece may be another variety or mineral.

Identified October 7, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids deposit quartz in cavities and veins, commonly in volcanic rocks; specimens range from recent to billions of years old, depending on deposit.

Uses & applications

Used in jewelry, carvings, décor, and mineral collections; lower-grade material is commonly tumbled.

Geological facts

Amethyst is the purple variety of quartz and can fade with prolonged exposure to strong sunlight or heat.

Field identification & locations

Identify by its purple color, glassy luster, and hardness; major sources include Brazil, Uruguay, Zambia, and Madagascar. The photo does not show enough detail to confirm every piece is amethyst.