Cat's eye
(kats' - i)
15th c.; ger; ouga, lat. oculus; gr. op-; Sans. aksi, lat. méd. cattus; egyp. techau
Chrysoberyl with a fibrous structure showing chatoyancy effect used as an hard gem in jewelry
Color
Transparent to translucent honey brown to apple green
Chemical composition
BeAl2O4
Crystal system
Orthorhombic
Hardness (Mohs scale)
8,5
Specific gravity
3,73 ±0,03
Refractive index
1,746 - 1755 ±0,005
Optical character
Biaxial +