 In its pure condition it contains 11.4 per cent of potassa (K2O), 37 per cent of alumina (A12O3), 38.6 per cent of sulphuric anhydride (SO?), and 13 percent of water (H2O).  Bulletin - Page 761914Full view - About this book
 | Digital images - 1912 - 1062 pages
...the United States Geological Survey indicates that the mineral alunite may become at some future time an important source of alumina. The mineral alunite...sulphate of aluminum and potassium, having the formula KjO.3Al,Os.4SOg.6ILO. In its pure condition it contains 11.4 per cent of potassa (K2O), 37 per cent... | |
 | Geological Survey (U.S.) - Geology - 1914 - 598 pages
...dynamically and otherwise altered, principally by sericitization and kaolinization. THE AL.TJNITE. The mineral alunite is a hydrous sulphate of aluminum and potassium, having the formula KjO.SAljOj^SOj.BHjO. When pure it contains 11.4 per cent of potassa (KjO), 37 per cent of alumina (A12O3),... | |
 | David White - Geology, Economic - 1914 - 600 pages
...been dynamically and otherwise altered, principally by sericitization and kaolinization. THE ALUNITE. The mineral alunite is a hydrous sulphate of aluminum and potassium, having the formula BLjO.3Al2Os.4SO3.6HjO. When pure it contains 11.4 per cent of potassa (KjO), 37 per cent of alumina... | |
 | Geological Survey of Canada - Geology - 1914 - 700 pages
...deposits are very doubtful sources of gold or silver. ALUNITE. General Relations .and Size of Deposits. Alunite is a hydrous sulphate of aluminum and potassium having the formula K3O, 3ALO-, 4SOa, MLO. When pure it contains 11-4 per cent of potash (K,O), 37-0 per cent of alumina,... | |
 | Mines and mineral resources - 1915 - 1006 pages
...arc not now suited to the He'roult or Hall processes, or to processes similar to them. NEW SOtTRCES OF ALUMINA. As before stated, bauxite is practically...sulphate of aluminum and potassium, having the formula K2O.3A12O3.4SO3.6H2O, and according to laboratory experiments made by Schaller of the Geological Survey... | |
 | United States. Bureau of Mines - Digital images - 1916 - 1150 pages
...United States Geological Survey indicates that the mineral alunite may become at some future time a source of alumina. The mineral alunite is a hydrous...sulphate of aluminum and potassium, having the formula ¿2O.3ALO3.4SO3.6H2O. In its pure condition it contains 11.4 per cent of potassa (K,O), 37 per cent... | |
 | Geology - 1913 - 1114 pages
...growth. Where the veinlets extend into the adjoining quartz they are generally less well developed. Alunite is a hydrous sulphate of aluminum and potassium, having the formula K2O.3A12O3.4SO3.6H2O. In its pure condition, which is rare in nature, it contains 11.4 per cent, of... | |
 | United States. Bureau of Mines - Digital images - 1912 - 1054 pages
...the United States Geological Survey indicates that the mineral alunite may become at some future time an important source of alumina. The mineral alunite...sulphate of aluminum and potassium, having the formula KjO.SAljO^SOj.GlLO. In its pure condition it contains 11.4 per cent of potassa (K2O), 37 per cent of... | |
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