mineral
Amethyst
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Pale to deep purple, lavender, or violet. Luster: Vitreous (glass-like). Crystal Structure: Hexagonal/Trigonal (trapezohedral). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pale to deep purple, lavender, or violet
- Luster
- Vitreous (glass-like)
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Physical properties
Hardness: 7 on Mohs scale. Color: Pale to deep purple, lavender, or violet. Luster: Vitreous (glass-like). Crystal Structure: Hexagonal/Trigonal (trapezohedral). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
Formation & geological history
Forms in igneous rocks, hydrothermal veins, and basaltic geodes. Its purple coloration is caused by irradiation of trivalent iron (Fe3+) trace impurities within the quartz crystal lattice.
Uses & applications
Widely used as a gemstone in jewelry (rings, pendants, beads), ornamental carvings, crystal healing practices, and mineral collection.
Geological facts
Amethyst is the birthstone for February. Ancient Greeks believed wearing or drinking from cups made of amethyst would prevent intoxication, deriving its name from the Greek 'amethystos', meaning 'not intoxicated'.
Field identification & locations
Identify by its distinctive purple hue, vitreous shine, and hardness of 7 (scratches glass). Common in Brazil, Uruguay, Madagascar, Zambia, and Russia. A favorite entry-level gemstone for rockhounds.
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Limonite
FeO(OH)•nH2O
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Limonite
FeO(OH)•nH2O
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Feldspar
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