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单词 corundum
释义

corundum /kə'rʌndəm//kə'rʌndəm/

英汉-汉英词典
n. 金刚砂,刚玉
词组 | 习惯用语
corundum products 刚玉制品
corundum brick 刚玉砖
英语例句库
  1. 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。

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原声例句
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Ruby and sapphire, for example, are actually the same mineral, called corundum, with a chemical formula of two aluminums and three oxygens.

例如,红宝石和蓝宝石实际上是同一种矿物,叫做刚玉,化学式为Al2O3。

中文百科

刚玉

Corundum.jpg
Corundum USGOV.jpg
Corindon azulEZ.jpg

刚玉是一种由氧化铝(Al2O3)的结晶形成的宝石。掺有金属铬的刚玉颜色鲜红,一般称之为红宝石;而蓝色或没有色的刚玉,普遍都会被归入蓝宝石的类别。

刚玉在摩氏硬度表中位列第9级。比重为4.00,有六角柱体的晶格结构。因着刚玉的硬度,和相对比钻石更低廉的价钱,它成为了砂纸及研磨工具的好材料。

英语百科

Corundum 刚玉

Corundum from Brazil, size about 2 cm × 3 cm (0.8 in × 1 in).
Crystal structure of corundum
Molar volume vs. pressure at room temperature.

Corundum is a crystalline form of aluminium oxide (Al
2
O
3
) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen.

近义、反义、联想词
近义词
n.
mineral

联想词
sapphire蓝宝石;gemstone宝石;quartz石英;diamond钻石,金刚石;opal猫眼石,蛋白石;diamonds钻石;crystalline水晶的;carbide碳化物;silica硅土;ruby红宝石;crystals晶体;
英英词典
corundum n.
  1. very hard mineral used as an abrasive

  2. synonymous: corundom
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更新时间:2025/6/18 19:53:58