mineral

Amethyst Quartz

Silicon Dioxide (SiO2 with iron impurities)

Hardness: 7 on Mohs scale; Color: Pale lavender to deep violet/purple; Luster: Vitreous (glass-like); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Pale lavender to deep violet/purple
Luster: Vitreous (glass-like)

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as linings in geodes within volcanic cavities. The purple color is caused by trace amounts of iron being irradiated by gamma rays from the surrounding rock. They can be found in formations dating from any period but are common in Mesozoic and Cenozoic basalt flows.

Uses & applications

Majorly used in jewelry as a semi-precious gemstone, in spiritual/metaphysical collecting, and as decorative ornamental pieces.

Geological facts

Amethyst was once considered as valuable as diamonds until large deposits were found in Brazil. 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 in the field by its characteristic purple hue, 7-hardness (will scratch glass), and lack of cleavage. Common locations include Brazil, Uruguay, South Korea, and Ontario, Canada. It is often found in river beds or weathering out of vugs in volcanic rocks.

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