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Chrysoberyl
IMA-Approved Mineral Species
Properties and Data
Physical Properties
Composition
BeAl
2
O
4
Chemical Name
Beryllium Aluminium Oxide
Molecular Weight
126.971 g/mol
Density
3.5 - 3.84 g/cm
3
Mohs Hardness
8.5
Crystal System
Orthorhombic
Optical Properties
Type
Biaxial (+)
Refractive Index
n
α
= 1.745 - 1.746
n
β
= 1.748 - 1.748
n
γ
= 1.754 - 1.756
Dispersion Factor
0.015
Birefringence
δ = 0.01
Additional Information
Otherwise known by Alexandrite, Diaphanite, Cymophane
Material articles have temporarily been disabled for renewal and polishing.
Variants and Types
Intrinsic
Intrinsic
Color: Colorless
Alexandrite
Alexandrite
Color: Color Change - Green, Blue, Red, Purple
Fluorescence: Red
Cause: Chromium Ions
Production and Synthesis
Czochralski Method
Czochralski Method
Involves pulling a crystal (boule) upward from a molten solution. Produces some of the purest crystals but requires a cleanroom environment.
Flux Method
Flux Method
Involves suspending a seed crystal near or inside flux with ingredients. Allows lower-temperature production. Sometimes produces gem-grade crystals.
Hydrothermal Method
Hydrothermal Method
Involves suspending a seed crystal into a high pressure / high temperature autoclave with liquid ingredients. Sometimes produces optics-grade ingots.
References
REFERENCES
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