Beryllium Aluminate
BeAl2O4:Cr3+
Chemical name
Beryllium Aluminate
Mineral name
Alexandrite (Laser)
Chemical formula
BeAl2O4:Cr3+
Melting point [°C]
1870
Crystal system
orthorhombic
Space Group
Pnma
Unit cell
a [Å]:5.47
b [Å]:9.39
c [Å]:4.42
Molecular weight [g/mol]
126.97
Mohs hardness
8.5
Density [g/cm3]
3.79
Color
green (for daylight), red (for artificial lightning)
Optical character
biaxial
Refractive Index
ng=1.753; nm=1.747; np=1.744
Doping [%]
0.3 - 1.0