mineral

Amethyst Quartz with Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Pale purple to translucent white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Pale purple to translucent white
Luster: Vitreous (glassy)

Identified March 21, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pale purple to translucent white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or as geodes within volcanic rocks where silica-rich fluids permeate cavities. The purple color is caused by trace amounts of iron and natural irradiation over millions of years.

Uses & applications

Used primarily in jewelry making (facet and cabochon), decorative ornaments, and widely collected by mineral enthusiasts for metaphysical or aesthetic purposes.

Geological facts

Amethyst is the birthstone for February. Its name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', as it was believed to protect the wearer from drunkenness.

Field identification & locations

Identify by its crystalline habit, lack of cleavage, and purple hues. It is commonly found in Brazil, Uruguay, and various parts of the United States. Collectors look for deep saturation and clarity.