A mixture of fused alumina/zirconia grains exhibiting the following chemical analysis, as percentages by weight: ZrO 2 + HfO 2: 35 - 45.5% Al 2 O 3: 43.7 - 65% Other oxides: < 10% SiO 2: < 0.8%; said mixture of grains exhibiting a content of grains comprising inclusions of less than 5%, the concentration of nodules, measured over a cross section of any grain of said mixture, being greater than 500 nodules per mm 2 in at least 50% of the grains examined, and being characterized in that it exhibits a loose packed density observing at least one of the following criteria: more than 97% by weight of the grains do not pass through a sieve of square mesh with a side length of 1400 μm and less than 20% by weight of the grains do not pass through a sieve of square mesh with a side length of 2360 μm, and the loose packed density is greater than 2.18 g/cm 3 and less than 2.43 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 1000 μm and less than 3% by weight of the grains do not pass through a sieve of square mesh with a side length of 1700 μm, and the loose packed density is greater than 2.04 g/cm 3 and less than 2.26 g/cm 3; more than 92% by weight of the grains do not pass through a sieve of square mesh with a side length of 600 μm and less than 18% by weight of the grains do not pass through a sieve of square mesh with a side length of 850 μm, and the loose packed density is greater than 1.94 g/cm 3 and less than 2.10 g/cm 3; more than 92% by weight of the grains do not pass through a sieve of square mesh with a side length of 425 μm and less than 18% by weight of the grains do not pass through a sieve of square mesh with a side length of 600 μm, and the loose packed density is greater than 1.85 g/cm 3 and less than 2.00 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 300 μm and less than 7% by weight of the grains do not pass through a sieve of square mesh with a side length of 500 μm, and the loose packed density is greater than 1.83 g/cm 3 and less than 1.97 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 250 μm and less than 3% by weight of the grains do not pass through a sieve of square mesh with a side length of 425 μm, and the loose packed density is greater than 1.82 g/cm 3 and less than 1.95 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 150 μm and less than 3% by weight of the grains do not pass through a sieve of square mesh with a side length of 250 μm, and the loose packed density is greater than 1.79 g/cm 3 and less than 1.93 g/cm 3, the content of grains containing inclusions being the percentage by number of grains comprising at least one inclusion, an inclusion being a string or a cluster of particles, the main constituent of which being a carbide or a combination of carbides, in contact with one another, the size of an inclusion being greater than 10 μm, the concentration of nodules being the number of nodules per mm 2 of surface area of a cross section of a grain, a nodule being a particle, the main constituent of which being a metal or a combination of metals or being a carbide or a combination of carbides and the size of which being less than or equal to 10 μm. more than 97% by weight of the grains do not pass through a sieve of square mesh with a side length of 1400 μm and less than 20% by weight of the grains do not pass through a sieve of square mesh with a side length of 2360 μm, and the loose packed density is greater than 2.18 g/cm 3 and less than 2.43 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 1000 μm and less than 3% by weight of the grains do not pass through a sieve of square mesh with a side length of 1700 μm, and the loose packed density is greater than 2.04 g/cm 3 and less than 2.26 g/cm 3; more than 92% by weight of the grains do not pass through a sieve of square mesh with a side length of 600 μm and less than 18% by weight of the grains do not pass through a sieve of square mesh with a side length of 850 μm, and the loose packed density is greater than 1.94 g/cm 3 and less than 2.10 g/cm 3; more than 92% by weight of the grains do not pass through a sieve of square mesh with a side length of 425 μm and less than 18% by weight of the grains do not pass through a sieve of square mesh with a side length of 600 μm, and the loose packed density is greater than 1.85 g/cm 3 and less than 2.00 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 300 μm and less than 7% by weight of the grains do not pass through a sieve of square mesh with a side length of 500 μm, and the loose packed density is greater than 1.83 g/cm 3 and less than 1.97 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 250 μm and less than 3% by weight of the grains do not pass through a sieve of square mesh with a side length of 425 μm, and the loose packed density is greater than 1.82 g/cm 3 and less than 1.95 g/cm 3; more than 96% by weight of the grains do not pass through a sieve of square mesh with a side length of 150 μm and less than 3% by weight of the grains do not pass through a sieve of square mesh with a side length of 250 μm, and the loose packed density is greater than 1.79 g/cm 3 and less than 1.93 g/cm 3,