Amethyst
Precious Gemstone
What is Amethyst?
Amethyst is a violet variety of quartz. It is a semiprecious gemstone prized for its rich color, ranging from pale lilac to deep purple. The color is due to the presence of iron and other trace elements. Amethyst is a popular gemstone used in jewelry and is also believed to have various metaphysical properties.
Optical Properties
- Refractive Index
- 1.544-1.553
- Birefringence
- 0.013
- Pleochroism
- Weak to none
- Optical Character
- uniaxial (+)
- Dispersion
- 0.013
Amethyst Market Value Calculator
Estimate the market value of Amethyst using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Amethyst Localities Map
See where Amethyst is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
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Quick Facts
Physical Properties
- Color
- Purple, violet, lilac
- Hardness (Mohs)
- 7
- Density
- 2.65 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon, oxygen, iron, titanium, manganese
Also Known As
AmethystPurple Quartz
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