Contributions to Mineralogy And Petrography From the Laboratories of the Sheffie
Contributions to Mineralogy And Petrography From the Laboratories of the Sheffie
Samuel Lewis Penfield
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35 per cent was obtained, but the weight had not become con- stant. At 150 the weight soon became constant and then at 200, 250 and 300, respectively, constant weights were obtained, and in each case the heating was continued until the loss of weight during several hours did not amount to more than a few tenths of a milligram. Between 300 and 360 no loss of weight was obtained, but the material still contained water which, as seen by a closed tube experiment, was expelled at much below a red he...at. The results obtained from 0. 6663 gram of the air-dry min- eral are as follows : Two days in desiccator Nine hours at 150 Seven hours at 200 Eight hours at 250 Five hours at 300 Below redness Total Proportional parts Loss. Using T * 5 of total H 2 as unity. Nothing 37. 41 13. 13 1. 82 0. 64 1. 41 0. 50 1. 05 0. 37 1. 08 0. 38 42. 77 It is evident from the above that 13 molecules are to be re- garded as water of crystallization and two molecules, sufficient AT WEST PATERSON, N. J. 251 to form four hydroxyls, as constitutional.
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