mineral
Amethyst
Amethyst (SiO2 with Iron impurities)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (trigonal), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (trigonal), Specific Gravity: 2.65
Formation & geological history
Formed in geodes within volcanic rocks and igneous environments when silica-rich water flows through cavities, depositing quartz crystals over millions of years.
Uses & applications
Primarily used in jewelry (faceting, cabochons), healing crystals, home decor, and mineral collecting.
Geological facts
Amethyst is the birthstone for February. Its name comes from the Ancient Greek word 'amethystos', meaning 'not intoxicated', as it was believed to prevent drunkenness.
Field identification & locations
Identify by its distinct purple hue, crystal habit, and hardness. It is commonly found in Brazil, Uruguay, Zambia, and Canada. Look for crystal transparency and internal inclusions.
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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