mineral
Amethyst crystal cluster
Amethyst, purple variety of quartz (SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; purple, vitreous luster, hexagonal crystal system, and no cleavage, with conchoidal fracture. The specimen appears to be a small cluster of crystals on a darker matrix.
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Physical properties
Mohs hardness 7; purple, vitreous luster, hexagonal crystal system, and no cleavage, with conchoidal fracture. The specimen appears to be a small cluster of crystals on a darker matrix.
Formation & geological history
Quartz crystals grew in silica-rich fluids within cavities in volcanic rock; purple color results mainly from iron impurities and natural irradiation. Such deposits formed at various times in Earth’s history.
Uses & applications
Used for jewelry, ornamental objects, and mineral collecting; small clusters are commonly displayed as décor.
Geological facts
Amethyst is the traditional February birthstone. Its color can fade with prolonged exposure to strong sunlight or heat.
Field identification & locations
Look for purple, six-sided quartz crystals with glassy luster and hardness sufficient to scratch glass. Important sources include Brazil, Uruguay, Zambia, and Madagascar.
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