 It is an exceptional case when there is exact agreement between the weight of fluoride and sulphate, and with the small amounts usually met in rocks the error may be an appreciable one in percentage of fluorine, though of no great significance otherwise.  Bulletin of the United States Geological Survey - Seite 187von Geological Survey (U.S.) - 1910Vollansicht - Über dieses Buch
 | 1919 - 304 Seiten
...CaSO 4 -CaF 2 :2F ::ba:x in which 5 is the weight of the sulphate and a that of the impure fluoride. It is an exceptional case when there is exact agreement...fluorine, though of no great significance otherwise. Y. Accuracy of the method.—It is evident from the above that if the greatest care is not taken to... | |
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