mineral
Amethyst Geode
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage.
Formation & geological history
Formed within gas cavities in volcanic rocks where silica-rich hydrothermal fluids slowly precipitated quartz crystals over millions of years.
Uses & applications
Widely used in high-end jewelry, decorative display pieces, and spiritual crystal collections.
Geological facts
The purple color is caused by natural irradiation and trace amounts of iron substituting for silicon within the quartz crystal lattice.
Field identification & locations
Easily identified by its distinct purple quartz crystal points lining the inside of a rounded rock cavity; major deposits occur in Brazil, Uruguay, and the USA.
