mineral
Amethyst crystal
Silicon Dioxide (SiO2) with iron impurities
Hardness: 7 (Mohs scale), Color: Purple to violet with clear/white base, Luster: Vitreous (glassy), Crystal structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture)
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Physical properties
Hardness: 7 (Mohs scale), Color: Purple to violet with clear/white base, Luster: Vitreous (glassy), Crystal structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture)
Formation & geological history
Formed in hydrothermal veins or as linings in geodes within igneous and metamorphic rocks. The purple color comes from irradiation of iron impurities within the quartz lattice.
Uses & applications
Primarily used in jewelry, as a decorative gemstone, and in mineral collections. Well-formed crystals are highly sought after by collectors.
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 its owner from drunkenness.
Field identification & locations
Identified by its distinctive purple hue and hexagonal crystal habit. Common locations include Brazil, Uruguay, Zambia, and South Korea. Collectors should look for deep uniform color and crystal clarity.
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