mineral
Amethyst Geode Piece
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Purple to violet crystals with a green-black basalt/celadonite matrix, Luster: Vitreous (glassy), Crystal system: Trigonal/Hexagonal, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Purple to violet crystals with a green-black basalt/celadonite matrix, Luster: Vitreous (glassy), Crystal system: Trigonal/Hexagonal, Specific Gravity: 2.65
Formation & geological history
Formed in volcanic igneous rocks (basalt) where gas bubbles created cavities. Silica-rich fluids then precipitated crystals over millions of years within these voids.
Uses & applications
Commonly used in jewelry, as decorative display specimens, and in metaphysical practices.
Geological facts
The purple color in amethyst is caused by irradiation, iron impurities, and the presence of trace elements. It was once considered as precious as diamonds until large deposits were found in Brazil.
Field identification & locations
Identify by purple crystalline structure attached to a dark, often bumpy or crust-like matrix. Commonly found in large deposits in Brazil and Uruguay. Collectors should look for deep purple color and clarity.
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