| AMETHYST |
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| Name | Amethyst |
| Formula | SiO2 |
| Hardness (Mohs) | 7 |
| Density | 2.63-2.65 |
| Crystal System | Trigonal |
| Colour | Wide range of purple shades from pale lilac to deep purple |
| Lustre | Vitreous |
| Associated minerals | Spinel, fluorite |
| Comment | Amethyst often becomes paler if kept out in the sun |
| Overall size of mineral specimen | 65 x 50 x 35 millimetres. |
| Size of individual crystals | 6 - 17 millimetres. |
| Location | Brasil |
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