Chrysoberyl
What is Chrysoberyl?
Chrysoberyl is an aluminate of beryllium with the formula BeAl2O4. The name chrysoberyl is derived from the Greek words chrysos and beryllos, meaning 'a gold-white gem'. It is the third-hardest natural gemstone and is known for its excellent transparency and luster. Chrysoberyl can exhibit a variety of colors, most notably yellow to greenish-yellow, but also brown, and in the case of alexandrite, a color-changing phenomenon.
Optical Properties
- Refractive Index
- 1.746-1.756
- Birefringence
- 0.005 to 0.009
- Pleochroism
- Distinct to weak
- Optical Character
- Biaxial (+)
- Dispersion
- 0.015
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Chrysoberyl 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.
Chrysoberyl Localities Map
See where Chrysoberyl is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Yellow, green, brown, and color-changing (alexandrite)
- Hardness (Mohs)
- 8.5
- Density
- 3.70 to 3.80 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- BeAl2O4
- Elements
- Beryllium, Aluminum, Oxygen
Also Known As
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Chrysoberyl FAQs
How do I identify Chrysoberyl?
Chrysoberyl can be identified by its hardness of 8.5 on the Mohs scale, Yellow color. Look for these key characteristics when examining specimens.
What color is Chrysoberyl?
Chrysoberyl typically appears in Yellow, green, brown, and color-changing (alexandrite). Color can vary depending on impurities and formation conditions.
How hard is Chrysoberyl?
Chrysoberyl has a hardness of 8.5 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.