mineral
Amethyst (Pale/Raw Crystal)
Silicon dioxide with iron impurities (SiO2)
Hardness: 7 (Mohs scale), Color: Pale purple/lavender to clear, Luster: Vitreous (glassy), Crystal structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale purple/lavender to clear, Luster: Vitreous (glassy), Crystal structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or geodes when silica-rich water cools. The purple color is caused by irradiation of iron impurities within the quartz lattice. Most specimens are from the Cretaceous period.
Uses & applications
Used primarily in jewelry, as gemstone specimens for collectors, and in spiritual/metaphysical practices.
Geological facts
Amethyst is a variety of quartz. Its name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', as it was once believed to prevent drunkenness. The color can fade if exposed to prolonged direct sunlight.
Field identification & locations
Identify by its six-sided crystal habit and purple hue. It can be found globally, with major deposits in Brazil and Uruguay. Collectors look for clarity, deep color saturation, and well-defined crystal terminations.
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Schist
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Epidote
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