mineral
Amethyst
Quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture, no true cleavage, specific gravity of 2.65
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Physical properties
Mohs hardness of 7, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture, no true cleavage, specific gravity of 2.65
Formation & geological history
Forms within gas cavities in volcanic rocks (vesicles in basalt) through hydrothermal solutions containing dissolved silica and iron impurities subjected to natural irradiation over millions of years
Uses & applications
Widely used as a gemstone in jewelry, ornamental carvings, and appreciated as a mineral specimen for crystal healing and collecting
Geological facts
The purple color is caused by irradiation and iron impurities substituting for silicon in the crystal lattice; historical cultures valued it as a talisman to prevent drunkenness
Field identification & locations
Easily identified by its distinct purple coloration and hardness of 7; commonly found in Brazil, Uruguay, Zambia, and the United States
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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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary