刚玉

True rubies are, in fact, the red variety of a mineral called corundum.

事实上，真正的红宝石是红色刚玉族矿物。

It also occurs, together with Corundum, Tourmaline, Topaz and other minerals in some pegmatites.

同时，她还与刚玉、电气石、黄玉等其它矿物质衍生在结晶花岗岩层中。

These corundum beds are estimated to be over a million years old.

这些刚玉病床估计超过1亿岁。

Special varieties of grinding with sintered corundum abrasives such as abrasive and fiber.

特殊品种的磨具有烧结刚玉磨具和纤维磨具等。

The corundum interacts with other natural phenomena such as light, and that is what causes asterisms in both sapphires and rubies.

刚玉交互的其他自然现象，如光，而这正是导致两蓝宝石和红宝石星群。

Moreover, corundum and periclase have not been detected in space dust before.

而且，此前在太空尘埃中还未侦测到刚玉和方镁石。

Geomorphic features relating to the formation of the inner plain west to the Fan-Gong dike, include (1) A series of surrounding rocky hills forming an arc-shaped embayment.

粘土矿物包括伊利石、蒙脱石、斜绿泥石和高岭石；碳酸盐矿物有文石、方解石和白云石；氧化物为刚玉、磁赤铁矿及赤铁矿。

The exoplanet's atmosphere condenses out minerals such as enstatite, corundum, spinel, and wollastonite.

这颗系外行星的大气冷凝后产生矿物，如：顽火辉石、刚玉、尖晶石和硅灰石。

The results shows that all these elements are enriched in the glass phase except for Al and Mn, and all the elements are depleted in the mullite-corundum phase except for Al.The iron group elementsand the ore-forming metalsare enriched in the ferruginous spheres, but the rest elements are depleted.

结果表明，除Al、Mn外，其他元素均在玻璃相中有不同程度的富集；除Al外，其他元素则在莫来石-刚玉相中有不同程度的贫化；除Ti以外的铁族元素以及除Ga、Pb以外的金属成矿元素均在铁质微珠中富集，其他元素则在其中贫化。

Taking black corundum particals as ceramics component, hypereutectoid steel as matrix metal, and Si-Fe as alloy, the crucibles of composites made of three layer components were obtained.

采用黑刚玉为陶瓷，过共析钢为基体金属，硅铁为合金构成三层复合材料坩埚。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。