mineral

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 on the Mohs scale; Color: Purple with translucent white bands; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Purple with translucent white bands
Luster: Vitreous (glassy)

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as linings in geodes within igneous or metamorphic rocks. Its purple color is the result of irradiation and trace amounts of iron. Chevron amethyst forms through alternating layers of amethyst and milky quartz, often in a V-shaped pattern.

Uses & applications

Extensively used in jewelry (cabochons, beads), decorative carvings, and as therapeutic 'healing stones' in alternative medicine. It is a highly popular specimen for rock collectors.

Geological facts

Until the 18th century, amethyst was included in the cardinal gemstones alongside diamond, ruby, emerald, and sapphire. It has been used since ancient Egyptian times for intaglio engraved gems and amulets.

Field identification & locations

Identified by its signature purple color and the white 'chevron' or zig-zag bands of milky quartz. It is commonly found in Brazil, Uruguay, Namibia, and Russia. In the field, look for hexagonal crystal points or banded patterns in river beds near volcanic sites.

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