Limestone Technical specifications Moisture ----------> 0.028% Silica sio2----------> 0.56% Alumina al2o3----------> 1.16% Iron oxide fe2o3----------> 0.13% Magnesium oxide mgo ---- Less Than 0.05% Calcium Oxide CaO --- 54.97% Sio2+al2o3+fe2o3+mgo = 1.9% max