Alumina: silica: lime: iron oxide: 63: 22: 6: 3 Iron oxide: alumina: silica: lime: 63: 22: 6: 3 Lime: silica: alumina: iron oxide: 63: 22: 6: 3 Silica: lime: alumina: iron oxide: 63: 22: 6: 3
Answer Discuss in Comment
"Scientists dream about doing great things. Engineers do them."