gemstone

Faceted purple gemstone, likely amethyst

Quartz (SiO₂), purple variety colored by trace iron and natural irradiation

AI-generated identification · may be incorrect

Typically Mohs hardness 7; vitreous luster, hexagonal crystal structure, and no cleavage. The oval faceted stone appears deep violet, though a photo cannot confirm its identity or treatments.

Identified October 11, 2026More gemstone →

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Physical properties

Typically Mohs hardness 7; vitreous luster, hexagonal crystal structure, and no cleavage. The oval faceted stone appears deep violet, though a photo cannot confirm its identity or treatments.

Formation & geological history

Amethyst forms in silica-rich hydrothermal fluids, commonly lining cavities in volcanic rocks; deposits range from ancient to geologically recent. Major sources include Brazil, Uruguay, Zambia, and Madagascar.

Uses & applications

Used in jewelry and mineral collections; quartz also has industrial applications in electronics and abrasives.

Geological facts

Amethyst’s purple color is associated with trace iron and radiation-related color centers; heating can turn some material yellow or green.

Field identification & locations

Check for quartz-like hardness, color zoning, and inclusions, but gem identification requires testing; glass and synthetic quartz can resemble natural amethyst. A loose stone of this apparent size may range from about $10–$200, depending on weight, clarity, cut, and provenance.