Mineral

Amethyst (Faceted)

Quartz (SiO2) with iron impurities

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: Pale to deep purple. Luster: Vitreous. Crystal structure: Hexagonal. Cleavage: None. Specific gravity: 2.65-2.66.

Hardness: 7 on Mohs scale
Color: Pale to deep purple
Luster: Vitreous

Identified May 8, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Pale to deep purple. Luster: Vitreous. Crystal structure: Hexagonal. Cleavage: None. Specific gravity: 2.65-2.66.

Formation & geological history

Forms in vugs/geodes in igneous rocks like basalt. Silica-rich fluids carrying trace amounts of iron are subjected to natural irradiation over geological time, creating the purple color.

Uses & applications

Predominantly used in jewelry as a faceted gemstone or cabochon. Also popular as rough specimens for collectors.

Geological facts

Amethyst is the birthstone for February and was once considered as valuable as ruby or emerald before large deposits were found in Brazil.

Field identification & locations

Identify by its purple color, hardness of 7 (can scratch glass), and vitreous luster. Commonly found in Brazil, Uruguay, Zambia, and various locations in the US.