Hematite single crystal (Natural) ( Fe2O3 )

Crystal properties
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