gemstone
Tumbled Amethyst
Silicon Dioxide (Quartz variety)
Hardness: 7 on Mohs scale. Color: Light to dark purple or violet. Luster: Vitreous (glass-like). Crystal structure: Trigonal (hexagonal system). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Light to dark purple or violet
- Luster
- Vitreous (glass-like)
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Physical properties
Hardness: 7 on Mohs scale. Color: Light to dark purple or violet. Luster: Vitreous (glass-like). Crystal structure: Trigonal (hexagonal system). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
Formation & geological history
Forms in hydrothermal veins and cavities (vugs or geodes) within basaltic and other volcanic rocks, where silica-rich solutions cool and crystallize over long geological timescales.
Uses & applications
Used primarily in jewelry, decorative items, and as a popular metaphysical or spiritual healing stone among collectors.
Geological facts
Amethyst was once considered as valuable as diamond, ruby, and emerald until large deposits were discovered in Brazil during the 19th century.
Field identification & locations
Identified by its distinctive purple color and conchoidal fracture. Common worldwide, with major deposits in Brazil, Uruguay, Madagascar, and the USA.
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