A method for increasing the crystallization ability of silicate melts when they are cooled at a practically acceptable rate under production conditions other than equilibrium is considered. It has been established that the addition of finely divided chromium ore in the amount of 1...3% to the charge of glandblendite stone melts is acceptable. This allows recrystallization of the parts of castings vitrified during cooling, which guarantees high performance properties of the products.