mineral
Amethyst
SiO2 (Amethyst is a variety of Quartz)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Violet to purple, often with color zoning. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal crystal system). Cleavage: None. Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Violet to purple, often with color zoning
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Violet to purple, often with color zoning. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal crystal system). Cleavage: None. Specific Gravity: 2.65.
Formation & geological history
Amethyst typically forms in hydrothermal veins or in cavities (geodes) within volcanic rocks. The purple color is due to irradiation of iron impurities (Fe3+) within the quartz structure. Its formation can occur over millions of years, often in ancient volcanic regions.
Uses & applications
Primarily used as a gemstone in jewelry due to its attractive color. Also valued by collectors and used for decorative items, carvings, and sometimes in New Age and spiritual practices.
Geological facts
The name 'amethyst' comes from the Greek 'amethystos', meaning 'not drunk', as it was believed to prevent intoxication. It's the birthstone for February. Large geodes lined with amethyst crystals are significant natural wonders.
Field identification & locations
Identify by its characteristic purple color, hardness (scratches glass), and six-sided prismatic crystal habit (though often found in massive form or as crystal points within geodes). Commonly found in Brazil, Uruguay, Russia, South Korea, Austria, and parts of 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
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
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