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alumiiniumi ja hapniku ühend - Al2O3, mida iseloomustab suur kõvadus (Mohsi skaala järgi 9) ning kõrge sulamistemperatuur 2030 °C ning mis esineb looduslikul kujul mineraalina (korund) või mida toodet, the name of the group of compounds having chemical formula Al2O3; characterized by high hardness (Mohs 9) and melting temperature of 2030 °C and used in natural form (corundum) or as a prepared compou, название группы веществ, имеющих химическую формулу Al2O3; характеризуются высокой твёрдостью (9 по шкале Мооса) и температурой плавления 2030 °С; имеются материалы как природного происхождения (корун
a compound in the form of a white powder or colorless hexagonal crystals which melts at 2020°C, is insoluble in water, and in used in the production of abrasives, aluminium, artificial gems, ceramics,