| Earlier in this chapter I said that the slag, or aluminum oxide, from the thermit process was an almost useless product. |
| It is composed of silica, alumina, carbonate of lime, magnesia and oxide of iron. |
| I also picked up a detached mass of argillaceous oxide of iron, and some fragments of striped hornstone. |
| In what respects does aluminium oxide differ from calcium oxide in properties? |
| When, finally, a precipitation of aluminum oxide takes place the liquid is almost free from iron. |
| It is virtually a compound of the two oxides, aluminum oxide and magnesium oxide. |
