| Crystal System |
Tetragonal |
| Chemical Comp.. |
TiO2 |
| Color |
Reddish
brown, almost opaque |
| Pleochroism |
Usually
weak |
| Cleavage |
Good
prismatic |
| Relief |
Extreme |
| Birefringence |
Extreme |
| 2V | --- |
| Optic Sign | Positive |
| Twinning |
Common: geniculate or cyclic |
Rutile - if nearly opaque the extreme birefringence is often masked. The color is best seen at the edges of the crystal.
