noun Herunterladen 🔗Teilen Korund An extremely hard mineral, a form of aluminum oxide with the chemical formula Al2O3, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive. Examples : "Because of its hardness, corundum is used in sandpaper to smooth rough wood. " Aufgrund seiner Härte wird Korund in Schleifpapier verwendet, um raues Holz zu glätten. mineral material geology substance chemistry science Mit KI chattenVokabelspielÜbung: Lesen