Amethyst
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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Amethyst before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Where to Find Amethyst
RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find amethyst in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find amethystAlways check the local rules and get the landowner's permission before you collect.
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Quick Facts
Physical Properties
- Color
- Purple, violet, lilac
- Hardness (Mohs)
- 7
- Rock tumbling
- With care
- Density
- 2.65 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon, oxygen, iron, titanium, manganese
Also Known As
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Amethyst FAQs
How do I identify Amethyst?
Amethyst can be identified by its hardness of 7 on the Mohs scale, Purple color. Look for these key characteristics when examining specimens.
What color is Amethyst?
Amethyst typically appears in Purple, violet, lilac. Color can vary depending on impurities and formation conditions.
How hard is Amethyst?
Amethyst has a hardness of 7 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.