| OPTICAL CALCITE ( ICELAND SPAR ) |
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| Name | Optical calcite (Iceland spar) |
| Formula | CaCO3 |
| Hardness (Mohs) | 3.5-4 |
| Density | 2.93-2.95 |
| Crystal System | Orthorhombic |
| Colour | Colourless |
| Lustre | Vitreous |
| Comment | Clear (Iceland Spar) variety displays an optical illusion called double refraction |
| Overall size of mineral specimen | 25 x 15 x 28 millimetres |
| Location | Mexico |
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