Name, (Formula)

%TiO₂

Colour

Hardness

Density

Crystal Form

Transparency

Ilmenite

(FeTiO₃)

52.6

black

5 - 6

4.5 - 5.0

hexagonal

opaque

Perovskite

(CaTiO₃)

58

Black, Brown, reddish-brown or yellow

5.5

4.48 - 4.26

Monoclinic (pseudocubic)

Rutile, anatase, brookite

(TiO₂)

95

reddish-brown, red, yellowish or black

6.0 - 6.5 (rutile)

5.5 - 6.0

(anatase and brookite)

4.23 - 5.5 (rutile)

3.82 - 3.97

(anatase) and 4.08 - 4.18

(brookite)

Tetragonal (rutile, anatase)

Orthorhombic (brookite)

opaque or subtransparent

Titanite (sphene)

(CaTiSiO₅)

35 - 40

Brown, green, grey, yellow or black

5.0 - 5.5

monoclinic

transparent to opaque