汉英词典
Chinese-English Dictionary
MEANING OF 刚玉
刚玉 (剛玉)
corundum (mineral)
〈名〉矿物,成分是三氧化二铝,桶状或柱状晶体,有玻璃光泽,硬度9,仅次于金刚石。红色透明的叫红宝石,其他颜色的叫蓝宝石,是贵重的装饰品。刚玉可用作精密仪器的轴承,也用作研磨材料。
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