Normal magnesia brick is made of Alumina-Magnesia spinel, periclase, It has higher temperature strength, good thermal shock stability, strong resistance to basic slag. 普通镁铝以镁铝尖晶石和方镁石为主要晶相，具有较高的高温强度和较好的热稳定性，抗碱性炉渣侵蚀。
Along with the rapid dissolution of spinel and diopside, the slag break into quantities of small particles, in which the perovskite is the dominant species. 镁铝尖晶石和透辉石的溶解导致高炉渣破碎成细小颗粒，其主要物相是钙钛矿。
