mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: purple to violet; Luster: vitreous (glassy); Crystal structure: Hexagonal (Trigonal); Cleavage: none; Specific gravity: 2.63 - 2.65
- Hardness
- 7 on Mohs scale
- Color
- purple to violet
- Luster
- vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: purple to violet; Luster: vitreous (glassy); Crystal structure: Hexagonal (Trigonal); Cleavage: none; Specific gravity: 2.63 - 2.65
Formation & geological history
Formed in igneous and metamorphic environments, typically within geodes or volcanic rocks where silica-rich fluids cool and crystallize over millions of years, often in Cenozoic or Mesozoic formations.
Uses & applications
Primarily used in jewelry, ornamental carvings, crystal healing, and as a popular decorative gemstone for collectors.
Geological facts
The purple color comes from irradiation, iron impurities, and the presence of trace elements. It was once considered as valuable as diamonds until large deposits were found in Brazil in the 19th century.
Field identification & locations
Identified by its distinctive purple hue and hexagonal crystal habits. Common locations include Brazil, Uruguay, Zambia, and South Korea. Collectors look for deep violet saturation and clarity.
