红刚玉颜色紫红色，硬度较强，适合制作切割类的磨具。红刚玉现多为人造制品。
你有什么规格的红刚玉?。
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.
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