mineral
Amethyst Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple to violet color, vitreous luster, hexagonal crystal system, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, hexagonal crystal system, and no cleavage.
Formation & geological history
Formed within gas cavities in volcanic rocks through the slow deposition of silica-rich hydrothermal fluids over millions of years.
Uses & applications
Widely used in fine jewelry, decorative home displays, and as a popular specimen for mineral collectors.
Geological facts
The purple color is caused by natural irradiation and trace amounts of iron impurities substituting for silicon in the crystal lattice.
Field identification & locations
Easily identified by its distinctive purple quartz crystals lining a hollow rock cavity; commonly sourced from Brazil, Uruguay, and Zambia.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous