| Crystal System |
Trigonal |
| Chemical Comp.. |
CaCO3 |
| Color |
Colorless |
| Pleochroism |
None |
| Cleavage |
Rhombohedral |
| Relief |
High |
| Birefringence |
Extreme |
| 2V | --- |
| Optic Sign | Negative |
| Twinning |
Lamellar |