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corundum    音标拼音: [kɚ'ʌndəm]
n. 刚玉,金刚砂

刚玉,金刚砂

corundum
n 1: very hard mineral used as an abrasive [synonym: {corundom},
{corundum}]


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  • Corundum - Wikipedia
    Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium, and chromium [3][4] It is a rock -forming mineral It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure [7]
  • Corundum: Use as a Gemstone, Abrasive, Refractory - Geology. com
    Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks It is an aluminum oxide with a chemical composition of Al 2 O 3 and a member of the trigonal crystal system
  • Corundum | Properties, Formation, Uses » Geology Science
    Corundum is a mineral that is primarily composed of aluminum oxide (Al2O3) and is one of the naturally occurring crystalline forms of aluminum oxide It is a very hard mineral and is commonly used as an abrasive in various industrial applications
  • Corundum | Aluminum Oxide, Gemstone, Abrasive | Britannica
    corundum, naturally occurring aluminum oxide mineral (Al 2 O 3) that is, after diamond, the hardest known natural substance Its finer varieties are the gemstones sapphire and ruby (qq v ), and its mixtures with iron oxides and other minerals are called emery (q v )





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