Beryllium Aluminium Silicate Cr doped
Be3Al2(SiO3)6:Cr
Chemical name
Beryllium Aluminium Silicate Cr doped
Mineral name
Emerald
Chemical formula
Be3Al2(SiO3)6:Cr
Crystal system
hexagonal
Crystal Class
P6/m?c6/m 2/m 2/m) – dihexagonal dipyramidal
Unit cell
a [Å]:9,21
b [Å]:
c [Å]:9,19
Molecular weight [g/mol]
537,50
Formula units
Z=2
Frequent crystal surfaces
(0001), (10-10), (11-20)
Mohs hardness
7,5-8,0
Color
green
Streak
white
Refractive Index
nε = 1.568–1.602 nω = 1.564–1.595
Birefringence δ
? = 0.0040–0.0070
Doping [%]
Cr