| Crystal System |
Tetragonal |
| Chemical Comp.. |
ZrSiO4 |
| Color |
Colorless
to Pale Brown |
| Pleochroism |
Weak
to None |
| Cleavage |
None |
| Relief |
High |
| Birefringence |
High 3rd/4th Order |
| 2V | --- |
| Optic Sign | Positive |
| Twinning |
None |
Zircon has very high relief and high birefringence. It is often found as inclusions in biotite in metamorphic rocks along with the characteristic pleochroic halo. Bi = Biotite; Zr = Zircon; Qz = Quartz.
