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意思解释：（Corundum）刚石。
主要成分为三氧化二铝的矿物。颜色不一，透明晶体，色彩很丰富。其硬度为9，无解理，具强烈的玻璃光泽。常用作工业上的磨料。红色透明的叫红宝石，绿色透明的叫绿宝石，是贵重的装饰品，也作精密仪器的轴承。…
Bases is 3 oxidation of 2 aluminium mineral. Color is differ, transparent crystal, color is very rich. Its hardness is 9, without cleavage, provide intense vitreous burnish. Often use as the abrasive on industry. Red calls ruby transparently, green calls beryl transparently, it is precious adornment, also make the bearing of accurate instrument. ...
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