Crystal growth method

Natural

Crystal orientation

(0001) (1010) (1120 others on request

Maximum size

up to 20 x 20 mm

Crystallographic properties

a = 5,04 A C = 13,77 A

Crystallographic structure

hexagonal

Twinning structure

natural defects

Colour

black

Density

5,20 g/cm³

Hardness

6,5