mineral
Amethyst
Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, no true cleavage, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, no true cleavage, specific gravity of 2.65
Formation & geological history
Forms in hydrothermal veins and gas cavities (vesicles) in volcanic rocks, where silica-rich solutions cool and crystallize over long geological periods.
Uses & applications
Widely used in jewelry, ornamental carvings, and as a popular collector's mineral specimen.
Geological facts
Amethyst was historically considered one of the cardinal gemstones, alongside diamond, ruby, sapphire, and emerald, until large deposits were found in Brazil.
Field identification & locations
Easily identified by its distinct purple coloration and quartz crystal form; commonly found in Brazil, Uruguay, Zambia, and the United States.
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Gneiss or Schist
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary