苏北某地超基性岩中，首次发现了红刚玉，少量已达宝石级。
In an ultrabasic rocks in North Jiangsu, corundum was first discovered and some was up to gem grade.
首先，研究了红柱石的粒度和加入量对莫来石-刚玉材料性能的影响。
At first, the effect of particle size and additions of andalusite on mullite-corundum materials were studied.
陶瓷结合剂白刚玉磨具会出现白里显红、红黄、青灰色调，严重影响产品的外观质量。
The white alumina abrasives made with vitrified bond may show red in white, red -yellow or celadon-gray. This will influence on the appearance quality of the products seriously.
冀东某地原生刚玉矿床具有埋藏浅，刚玉个体大、微红至暗红色、半透明至不透明等特点，经人工改善可生产低档红宝石。
The primary corundum deposit in eastern Hebei is near the ground surface. The corundum is megacrysts, pink or dark red color, semi-transparence to opaque.
冀东某地原生刚玉矿床具有埋藏浅，刚玉个体大、微红至暗红色、半透明至不透明等特点，经人工改善可生产低档红宝石。
The primary corundum deposit in eastern Hebei is near the ground surface. The corundum is megacrysts, pink or dark red color, semi-transparence to opaque.
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