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Glittering
Stones >> Semi
Precious Stones >> Corundum
Semi Precious Stone Corundum
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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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 |
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Precious corundum Jewelry
| Corundum Bracelet |
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| Corundum Earrings |
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| Corundum Necklace |
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| Corundum Rings |
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