mineral

Amethyst (Chevron or Dream Amethyst variety)

Tectosilicate Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 (Mohs scale); Color: Purple with white or gray quartz bands; Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Purple with white or gray quartz bands
Luster: Vitreous

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Purple with white or gray quartz bands; Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or volcanic geodes when silica-rich water cools. The 'chevron' banding occurs through rhythmic growth phases of amethyst and milky quartz over millions of years, often in the Proterozoic or Mesozoic eras.

Uses & applications

Predominantly used for lapidary work including cabochons, beads, and pocket stones. Also highly popular in the metaphysical and crystal collecting communities.

Geological facts

The purple color is caused by gamma irradiation of trivalent iron (Fe3+) within the quartz structure. Amethyst was considered a Cardinal Gem—one of the five most precious stones—until large deposits were discovered in Brazil in the 1700s.

Field identification & locations

Identify in the field by its distinct V-shaped or 'zigzag' bands of white quartz alternating with purple. Often found in Brazil, Uruguay, Namibia, and Zambia. In its raw form, look for hexagonal crystal points in geodes.

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