Normal magnesia brick is made of Alumina-Magnesia spinel, periclase, It has higher temperature strength, good thermal shock stability, strong resistance to basic slag. 普通鎂鋁以鎂鋁尖晶石和方鎂石為主要晶相，具有較高的高溫強度和較好的熱穩定性，抗堿性爐渣侵蝕。
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. 鎂鋁尖晶石和透輝石的溶解導致高爐渣破碎成細小顆粒，其主要物相是鈣鈦礦。
