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认识刚玉

Release date:2017-10-31  source:矿业俱乐部  Browse times:848

刚玉是一种氧化矿物,在自然界的物质中,它的硬度仅次于金刚石。我们常听到的蓝宝石、红宝石其实就是优良的刚玉。刚玉在自然界分布很广泛,但它也很容易风化而变成其他矿物。它呈柱形晶体、大块体、圆颗粒状,在火成岩、沉积岩和变质岩中都会有。除了被当作宝石,刚玉还有着很多的工业用途,如作轴承、耐火材料、磨料、砂轮砂纸等等。把铝土矿矿石放在电弧炉中加热,使矿石熔化后再凝固时,便可得到大而纯的洁白人造刚玉晶体,如果不太纯则为细小的黑晶体,一般则为半透明的红褐色晶体。

 

 
 
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