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汉语拼音：gāng yù

矿物名。化学式Al2O3。硬度仅次于金刚石。晶体常为柱状，一般为蓝灰、黄灰色。红色透明的叫红宝石，蓝色透明的叫蓝宝石。目前已人工制成红宝石，可用作激光材料。普通刚玉可做仪表轴承、研磨材料。

1. 即刚石。

• The company mainly produces high-grade sand F, P sand and refractory materials, with an annual output of one million tons of sand corundum.

  公司主要生产高档F砂、P砂及耐火原料，年产棕刚玉砂一万余吨。

• In an ultrabasic rocks in North Jiangsu, corundum was first discovered and some was up to gem grade.

  苏北某地超基性岩中，首次发现了红刚玉，少量已达宝石级。

• Minerals in the residues including mullite, corundum, quartz, and a trace amount of calcite and K-feldspar.

  燃煤产物中的矿物有莫来石、刚玉、石英，以及少量方解石和钾长石。

• It introduces process control point of chrome corundum permeable brick and its application in smelting ferroalloys.

  介绍了铬刚玉透气砖的生产控制要点和在铁合金精炼中的应用方法。

• Corundum, any color other than red, is called "sapphire. "

  而红色以外的各色刚玉则通称为『蓝宝石』。

• Our company exports white corundum products perennially to Japan, Korea, Europe and the United States and other countries and regions.

  用于生产耐磨粉、喷涂于耐磨纸上，作耐磨地板用。我公司常年向日本、韩国、欧美等国家和地区出口白刚玉产品。

• to the corundum structure except that the cations are of two different types.

  除了阳离子是两种不同种类以外，它和刚玉构型非常接近。

• Emery, Natural Corundum, Natural Garnet, Natural Abrasives, Aluminum Oxide, Waste Of Plastics, Parings Of Plastics, Iron.

  新加坡公司求购刚玉砂，天然金刚砂，天然石榴石，天然磨料，氧化铝，塑料废料，塑料切片。

• Black colour, its hardness is higher than that of WA, its toughness is a bit lower.

  黑色，有光泽，硬度比白刚玉高，韧性较低。