gemstone

Tumbled amethyst (likely)

Quartz, SiO₂; purple variety known as amethyst

AI-generated identification · may be incorrect

Small, polished translucent lavender-purple pebble with a vitreous luster; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The image alone cannot confirm that the color is natural or identify the stone with certainty.

Identified October 12, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms as quartz crystals in cavities of volcanic rocks, commonly during the Mesozoic or younger; tumbling has rounded and polished the specimen.

Uses & applications

Used in jewelry, ornaments, and mineral collections.

Geological facts

Amethyst’s purple color is associated with iron impurities and natural irradiation; tumbling alters its shape and finish, not its geological identity.

Field identification & locations

Check for glass-like translucency, hardness, and quartz-like fracture; common sources include Brazil, Uruguay, and Zambia. Similar-looking dyed agate or glass can be distinguished more reliably by testing or examination.