一种极硬的矿物,为氧化铝的一种形式,化学式Al2O3,以蓝宝石和红宝石的形态存在,可用作磨料。
corundums — plural of corundum
金刚砂；[化] 刚玉
一种极硬的矿物,为氧化铝的一种形式,化学式Al2O3,以蓝宝石和红宝石的形态存在,可用作磨料。
An extremely hard mineral, a form of aluminum oxide with the chemical formula Al2O3, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.
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