| CORUNDUM SAPPHIRE / RUBY |
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| Name | Sapphire and ruby |
| Formula | Al2O3 |
| Hardness (Mohs) | 9 |
| Density | 3.99-4.10 |
| Crystal System | Trigonal |
| Colour | Blue, purple, yellow, green |
| Lustre | Diamond lustre, greasy lustre on less transparent crystals |
| Associated minerals | Cordierite, spinel, zircon |
| Overall size of mineral specimen | sapphire 22 x 17 x 17 millimetres
ruby 10 x 8 x 10 millimetres |
| Location | Sapphire from Tanzania
ruby from Zaire |
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