Hematite
Refractive Index low
ne 2,870 - 2,940
Refractive Index high
no 3,150 - 3,220
Birefringence
0.280 - 0.280
Density
4.95 - 5.28
Polariscope
1 negative
Colours:
grey, red, black
Transparency:
Opaque
Pleochroism:
brownish red/yellowish red
Remarks:
not magnetic, streak colour: red, splintery fracture
colors: metallic, partly red, steel grey
Hardness:
5 - 6,5
Formula:
Fe2O3
System:
Hexagonal
Rare?
3