Abstract: High strength abrasive products are prepared according to the following steps; (a) pouring a molten abrasive composition which takes a needle-like crystal structure upon freezing thereof into a mold set comprising two molds, one surface of said molds having hemisphere-like projections of the same size disposed regularly and closely to each other, the two molds being brought into contact with each other or to within 5 mm apart from each other in such a way that the projections of one mold surface fit into the cavities between the projections of the other, (b) subjecting the molten abrasive composition to cooling for freezing, (c) removing the frozen mass from the molds and (d) crushing the mass into abrasive grains.