| GREEN TOURMALINE CRYSTALS ON QUARTZ CRYSTAL |
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| Name | Tourmaline |
| Formula | (Na, Ca)(Li, Mg, Al)(Al, Fe, Mn)6(BO3)3(Si6O18)(OH)4 |
| Hardness (Mohs) | 7-7.5 |
| Density | 3.00-3.20 |
| Crystal System | Trigonal |
| Colour | Red, green, brown, black, multicoloured |
| Lustre | Vitreous, resinous lustre on fracture surfaces |
| Associated minerals | Amethyst, olivine, sapphire, topaz |
| Size of individual crystals | 15 - 26 millimetres. |
| Location | Brasil |
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