Magnesium aluminium spinell (1MgO 3Al2O3:Co) Co doped (blue) Magnesium aluminium spinell (MgAl2O4:Co2+)

Dimensions of crystals, mm

 

Magnesium

Length

70

Diameter

30

Syngony

cubic

Spatial group

Fd3m

Elementary cell parameters, nm

0.8086

 

Modulus of elasticity

2.3´105

 

Density, g/cm3

3.58

 

Mohs hardness

8-9

 

Melting point, °C

2105

 

Refraction index

1.718-1.75

 

CoO concentration, mass.%

0.05-0.3