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| Apatite | ||
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| Danburite | ||
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| Malaya | ||
| Rhodolite | ||
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| RUBY MINERAL NATURAL COLOR Hardness 9 |
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| RETURN TO »» RUBY MINERAL | |
| Corundum is composed of pure alumina; its colouring is due to metallic | ||
| oxide traces or inclusions. The color of ruby is due to chromium oxide. | ||
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| Ruby, natural tabular crystal 9.58 cts. / 16.2 x 13.4 x 3.4 mm ( Deep red ) semi glossy |
| SOLD
ref RUrs958c
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| Hardness: | 9 | 
Ruby
discovery
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| Specific Gravity: | 3.9 - 4.1 | |
| Refractive Index: | 1.76 - 1.78 |  Corundum
data |
| Chemical Composition: | Al2O3, Aluminum Oxide | 
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question |
| Crystal Structure: | Trigonal | |
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Ruby
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