Al2O3

Al2O3
Corundum Co*run"dum (k[-o]*r[u^]n"d[u^]m), n.; pl. {Corundums} (k[-o]*r[u^]n"d[u^]mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The mineral alumina ({Al2O3}), as found native in a crystalline state. Transparent varieties are used as gemstones, 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. [1913 Webster +PJC]

Note: The name corundum is sometimes restricted to the non-transparent or coarser kinds. {Emery} is a dark-colored granular variety, usually admixed with magnetic iron ore. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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Look at other dictionaries:

  • Al2O3 — Kristallstruktur Allgemeines Name Aluminiumoxid Andere Namen Korund (Mineral) Tonerde …   Deutsch Wikipedia

  • Al2O3 — Sapphire Sap phire (? or ?; 277), n. [OE. saphir, F. saphir, L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.] 1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3}; corundum; esp., the blue transparent variety of corundum,… …   The Collaborative International Dictionary of English

  • Al2O3 — Sesquioxide Ses qui*ox ide, n. [Sesqui + oxide.] (Chem.) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, {Al2O3} is a sesquioxide. [1913 Webster] …   The Collaborative International Dictionary of English

  • Al2O3 — Alumina A*lu mi*na, n. [L. alumen, aluminis. See {Alum}.] (Chem.) One of the earths, consisting of two parts of aluminium and three of oxygen, {Al2O3}. [1913 Webster] Note: It is the oxide of the metal aluminium, the base of aluminous salts, a… …   The Collaborative International Dictionary of English

  • Al2O3 — Cette page répertorie différents polymorphes, solides qui possèdent la même composition chimique mais une structure cristalline différente.   Al2O3 est la formule chimique de : Alumine, Bauxite, Corindon (αAl2O3), Rubis, Saphir …   Wikipédia en Français

  • Al2O3 — …   Википедия

  • AL2O3 — Aluminum Oxide (aka Alumina or Sapphire) (Academic & Science » Electronics) …   Abbreviations dictionary

  • Al2O3 — • aluminum oxide (alumina) …   Maritime acronyms and abbreviations

  • Зависимость краевого угла смачивания поверхности графита для систем NaF - AlF3 и Na3AlF6 - Al2O3 от криолитового отношения и концентрации глинозема при 1050 °С (атмосфера - аргон) — Система NaF AlF3 (время выдержки 1 мин) КО 18,01 5,76 4,68 3,00 2,82 2,61 …   Химический справочник

  • Точки нонвариантных равновесий системы Na3AlF6 - AlF3 - Al2O3 — Точка Температура кристаллизации, °С Состав, % (мол.) Состав, % (масс.) Na3AlF6 AlF3 Al2O3 …   Химический справочник

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