mineral

Amethyst (Chevron or Banded)

Silicon Dioxide with impurities (SiO2)

Hardness: 7 on Mohs scale; Color: Purple with white quartz banding; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Purple with white quartz banding
Luster: Vitreous (glassy)

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Purple with white quartz banding; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins or volcanic cavities (geodes). The purple color comes from irradiation of iron impurities within quartz. The banding occurs when the growth conditions change, alternating between amethyst and white milky quartz.

Uses & applications

Commonly used for lapidary work, jewelry, decorative ornaments, and widely collected as metaphysical stones or tumbled specimens.

Geological facts

Amethyst was considered a precious stone equal in value to Diamond until large deposits were discovered in Brazil in the 19th century. The name 'amethyst' comes from the Greek word 'amethystos', meaning 'not intoxicated'.

Field identification & locations

Identify by its distinct purple hue and V-shaped (chevron) white quartz patterns. It is extremely common in Brazil, Uruguay, Africa, and parts of the USA. For field identification, look for its ability to scratch glass and lack of cleavage.

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