镁质土,镁>21%,白度>45,钙<1%镁质泥,滑石泥,已作多次综合化验
铝≥18%,铁≤1.56%,白度≥12
铝含量(Al2O3)4.35%,镁含量(MgO)19.55%,烧失量5.15%,烧白度45.4,收缩率5.2%