gemstone

Tumbled amethyst

Quartz, SiO₂; purple coloration typically from iron impurities and natural irradiation

AI-generated identification · may be incorrect

Violet, translucent, and polished with a vitreous luster; trigonal crystal structure. Mohs hardness 7, with no cleavage and conchoidal fracture; a tumbled stone’s shape obscures these features.

Identified October 4, 2026More gemstone →

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Physical properties

Violet, translucent, and polished with a vitreous luster; trigonal crystal structure. Mohs hardness 7, with no cleavage and conchoidal fracture; a tumbled stone’s shape obscures these features.

Formation & geological history

Forms as quartz crystals in gas cavities of volcanic rocks and in hydrothermal veins. Amethyst deposits range in age; major sources include Brazil and Uruguay.

Uses & applications

Used in jewelry, ornaments, and mineral collections; lower-grade material is often tumbled for decorative use.

Geological facts

Amethyst is the purple variety of quartz, and its color can fade with prolonged heat or sunlight exposure.

Field identification & locations

The image shows a small, polished purple specimen consistent with amethyst; confirm by hardness and, if available, crystal habit before distinguishing it from other purple minerals. Common sources include Brazil, Uruguay, Zambia, and Madagascar.