gemstone
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
Hardness: 7 (Mohs), Color: Light violet/pinkish-purple, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (trigonal), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: Light violet/pinkish-purple, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (trigonal), Specific Gravity: 2.65
Formation & geological history
Typically forms in hydrothermal veins and volcanic geodes. This pinkish-purple hue often results from specific geochemical conditions or heat treatment during formation or processing.
Uses & applications
Primary use is in jewelry (rings, pendants, earrings) and as a decorative collector's item.
Geological facts
Amethyst was once considered a Cardinal Gem, as valuable as Diamond, until large deposits were found in Brazil. The name comes from the Greek 'amethystos', meaning 'not intoxicated'.
Field identification & locations
Identified by its distinctive purple hue and hexagonal crystal habit when in raw form. Commonly found in Brazil, Uruguay, and Madagascar. In faceted settings, look for color zoning or natural inclusions.
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