gemstone

Tumbled purple gemstone, likely amethyst

Amethyst, purple variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent purple body with vitreous luster, likely polished/tumbled. Quartz has a hexagonal crystal structure and no true cleavage; color comes mainly from iron impurities and irradiation.

Identified September 3, 2026More gemstone →

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Physical properties

Formation & geological history

Forms in silica-rich hydrothermal veins and volcanic cavities, commonly as quartz linings in basaltic geodes. The photographed piece is human-shaped and polished; its exact geological age and identity cannot be confirmed from the image.

Uses & applications

Used for inexpensive jewelry, ornaments, lapidary pieces, and mineral collections. Common tumbled specimens generally have modest commercial value.

Geological facts

The purple color can fade with prolonged strong sunlight or heating. A scratch test against ordinary steel or glass is suggestive but risks damaging the specimen.

Field identification & locations

Likely amethyst if the purple color is natural and internally translucent, but it could also be dyed quartz or another purple stone; inspect for color zoning, quartz-like inclusions, and a glassy surface. Major sources include Brazil, Uruguay, Zambia, and Namibia.