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corundum |
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corundum [kəˈrʌndəm] n (Earth Sciences / Minerals) a white, grey, blue, green, red, yellow, or brown mineral, found in metamorphosed shales and limestones, in veins, and in some igneous rocks. It is used as an abrasive and as gemstone; the red variety is ruby, the blue is sapphire. Composition: aluminium oxide. Formula: Al2O3. Crystal structure: hexagonal (rhombohedral) [from Tamil kuruntam; related to Sanskrit kuruvinda ruby]
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Translations corundum n (Geol) → Korund m How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Ash piping, chutes, fan blades, air separators lined with Abresist fused cast basalt, alumina ceramic or Kalcor alumina zirconia corundum. Its densely packed atoms make corundum Earth's second-hardest mineral. Another hypothesis for the polish on the Stone Age corundum ax head is that the Stone Age people never had absolutely pure corundum, which indeed would have required diamond to polish ("In the Buff: Stone Age tools may have derived luster from diamond" SN: 2/19/05, p. |
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