mineral
Amethyst crystal
Quartz (SiO₂), purple variety colored by trace iron and irradiation
AI-generated identification · may be incorrectMohs hardness 7; translucent purple with vitreous luster and hexagonal crystal form. The pointed termination and visible faces are consistent with a small quartz crystal.
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Physical properties
Mohs hardness 7; translucent purple with vitreous luster and hexagonal crystal form. The pointed termination and visible faces are consistent with a small quartz crystal.
Formation & geological history
Amethyst forms as quartz crystals in mineral-rich fluids within cavities, commonly in volcanic rocks; its age varies with the deposit. The image does not establish its geological source or age.
Uses & applications
Used in jewelry, ornaments, and mineral collections; small crystals are widely sold as specimens.
Geological facts
Amethyst’s purple color is associated with trace iron and natural radiation exposure; heating can turn some amethyst yellow or orange, resembling citrine.
Field identification & locations
Common sources include Brazil, Uruguay, and Zambia. Identify it by its purple color, glassy luster, pointed quartz termination, and hardness sufficient to scratch glass.
