mineral

Amethyst

Silicon Dioxide (SiO2) with traces of Iron and Manganese

Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender with white banding (chevron type); Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Luster: Vitreous (glassy)

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as geodes inside volcanic rock (basalt) where silica-rich fluids cool and crystallize over millions of years. The color is caused by irradiation and iron impurities.

Uses & applications

Used extensively in jewelry (faceted or cabochon), ornamental carvings, and as a popular semi-precious collector stone.

Geological facts

The name comes from the Greek 'amethystos', meaning 'not intoxicated', as ancient Greeks believed it prevented drunkenness. It is the official birthstone for February.

Field identification & locations

Identify by its distinctive purple color and ability to scratch glass. Commonly found in Brazil, Uruguay, and Madagascar. Tumbled specimens like this one are often found in gift shops and starter collections.

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