Rock Identifier
Amethyst (Quartz (Silicon Dioxide, SiO2)) — gemstone
gemstone

Amethyst

Quartz (Silicon Dioxide, SiO2)

AI-generated identification · may be incorrect

Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, and trigonal crystal system with conchoidal fracture.

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Physical properties

Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, and trigonal crystal system with conchoidal fracture.

Formation & geological history

Forms within gas cavities in volcanic rocks through hydrothermal solutions containing iron and silica, often over millions of years.

Uses & applications

Extensively used in fine jewelry, decorative carvings, metaphysical collections, and lapidary art.

Geological facts

Amethyst was once as valuable as diamond, ruby, and emerald until large deposits were discovered in Brazil during the 19th century.

Field identification & locations

Easily identified by its distinctive purple coloration and high hardness; commonly sourced from Brazil, Uruguay, and Zambia.