| He called the new compound Carborundum because the natural mineral form of alumina is called corundum. |
| Some of the alumina and iron oxide may occasionally be chemically combined, so as to form an iron spinel, or hercynite. |
| These products, also known as corundum, are obtained by fusing alumina or bauxite in an electric arc furnace. |
| Quartz ought to exist in a state of hydrate, and Wavellite, not corundum, ought to be the state of alumina in granite. |
| Some of the studied rocks show high alumina characteristics probably reflecting the high modal content of very calcic plagioclase. |
| And the unstable alumina distribution in the electrolyte furtherly causes larger voltage fluctuation of the cell. |
