mineral

Amethyst Quartz Druse

Silicon Dioxide (SiO2) with iron impurities

Hardness: 7 on Mohs scale; Color: Pale lavender to light purple; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); SG: 2.65

Hardness: 7 on Mohs scale
Color: Pale lavender to light purple
Luster: Vitreous (glassy)

Identified March 7, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pale lavender to light purple; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); SG: 2.65

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids deposit crystals in rock cavities (geodes or veins). The purple hue comes from irradiation of iron impurities in the crystal lattice. These can range from millions to over a billion years old depending on the host rock.

Uses & applications

Used primarily for jewelry (faceted gems, beads), decorative home decor, and spiritual/metaphysical collecting. Industrial quartz is used in glassmaking and electronics.

Geological facts

Amethyst was considered one of the five cardinal gemstones until large deposits were found in Brazil. The name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', due to a belief it prevented drunkenness.

Field identification & locations

Identify by its purple color and hexagonal crystal terminations. Commonly found in Brazil, Uruguay, and Namibia. In the field, look for crystalline clusters within hollow volcanic rocks or mineral veins. Collectors look for deep color saturation and undamaged crystal points.

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