manufactured corundum - translation to ρωσικά
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manufactured corundum - translation to ρωσικά

OXIDE MINERAL
Tranparent alumina; Corundum structure; Corundum Structure; Corrundum; Α-Al2O3; Artificial corundum; Synthetic corundum
  • abbr=on}}
  • Molar volume vs. pressure at room temperature
  • Crystal structure of corundum

manufactured corundum      

общая лексика

искусственный корунд

corundum         

[kə'rʌndəm]

общая лексика

корунд

корундовый

наждак

алмазный шпат

существительное

минералогия

корунд

corundum         
корунд

Ορισμός

Corundum
·noun The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

Βικιπαίδεια

Corundum

Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. Corundum has two primary gem varieties: ruby and sapphire. Rubies are red due to the presence of chromium, and sapphires exhibit a range of colors depending on what transition metal is present. A rare type of sapphire, padparadscha sapphire, is pink-orange.

The name "corundum" is derived from the Tamil-Dravidian word kurundam (ruby-sapphire) (appearing in Sanskrit as kuruvinda).

Because of corundum's hardness (pure corundum is defined to have 9.0 on the Mohs scale), it can scratch almost all other minerals. It is commonly used as an abrasive on sandpaper and on large tools used in machining metals, plastics, and wood. Emery, a variety of corundum with no value as a gemstone, is commonly used as an abrasive. It is a black granular form of corundum, in which the mineral is intimately mixed with magnetite, hematite, or hercynite.

In addition to its hardness, corundum has a density of 4.02 g/cm3 (251 lb/cu ft), which is unusually high for a transparent mineral composed of the low-atomic mass elements aluminium and oxygen.

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