mineral

Amethyst (Chevron/Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 (Mohs scale), Color: Purple to violet with white/opaque quartz banding, Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified March 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or volcanic geodes where silica-rich fluids cool and crystallize. The purple color is caused by irradiation of iron impurities within the quartz lattice. Most gem-quality amethyst is between 50 and 200 million years old (Mesozoic era).

Uses & applications

Primary use is in jewelry (faceted gemstones, beads, cabochons), metaphysical/spiritual collecting, and interior decor such as bookends or cathedral geodes.

Geological facts

According to Greek mythology, Amethyst was a maiden turned to white stone who became purple when Dionysus poured wine over her. It was historically considered one of the 'Cardinal Gems' until large deposits were found in Brazil in the 1700s.

Field identification & locations

Identify in the field by its distinct purple color and V-shaped (chevron) white quartz banding. Commonly found in Brazil, Uruguay, Zambia, and South Korea. Collectors should look for deep saturation and clarity.

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