mineral

Tumbled purple quartz, possibly amethyst

Quartz (SiO₂), likely iron-colored amethyst

AI-generated identification · may be incorrect

Hardness 7 Mohs; dark purple-brown color with a waxy to vitreous polish, massive texture, and no visible cleavage. Exact identification is limited by the small, rounded, low-resolution image.

Identified September 7, 2026More mineral →

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Physical properties

Hardness 7 Mohs; dark purple-brown color with a waxy to vitreous polish, massive texture, and no visible cleavage. Exact identification is limited by the small, rounded, low-resolution image.

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids in cavities and veins; purple amethyst coloration develops mainly from iron impurities and natural irradiation. Deposits range from Precambrian to younger volcanic-hosted formations.

Uses & applications

Used as an inexpensive ornamental and lapidary stone, in jewelry, décor, and mineral collections. Common tumbled pieces typically have modest value.

Geological facts

Amethyst is quartz colored by trace iron rather than a separate mineral species; heating can turn it yellow-orange, producing citrine-like material.

Field identification & locations

Likely recognized by purple color, glassy polish, and quartz hardness; test cautiously with a steel file or glass, as a genuine quartz piece should resist scratching. Common sources include Brazil, Uruguay, Zambia, and Mexico.