Historical Facts of Corundum
| Refractive index | 1.768 - 1.772, 1.760 - 1.763 |
| Hardness | 9 |
| Category | Mineral |
| Chemical Composition | Trigonal Hexagonal Scalenohedral |
| Color | Brown, yellow, red, blue and violet colors |
| Major varieties | Sapphire, Ruby, Emery |
Sunday, December 5, 2010
All About Corundum stone
Corundum is the second hardest natural mineral according to science. The hardest mineral, diamond is still four times harder than the corundum. The hardness of corundum could be partially attributed to the strong and short oxygen-aluminum bonds. These bonds pull the oxygen and also aluminum atoms close together, making the crystal not only hard but quite dense for the mineral made up of two relatively light elements.
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