. Radiometric investigation of water of crystallization, light filters and standard absorption bands . hysical Laboratory, who found 2 per cent of water, whichappears to be present in solid solution. The section of tremolitewas of sufficient thickness to insure detecting the water, providedits absorption is as great as in the liquid phase. The equivalentlayer of water was mm, but no water bands could bedetected. It is evident from this and from the transmission of alayer of water mm m thickness (Fig. 1,6), that the waterin tremolite is in an entirely different condition from that
. Radiometric investigation of water of crystallization, light filters and standard absorption bands . hysical Laboratory, who found 2 per cent of water, whichappears to be present in solid solution. The section of tremolitewas of sufficient thickness to insure detecting the water, providedits absorption is as great as in the liquid phase. The equivalentlayer of water was mm, but no water bands could bedetected. It is evident from this and from the transmission of alayer of water mm m thickness (Fig. 1,6), that the waterin tremolite is in an entirely different condition from that whichobtains in the crystals and in the solid solutions previously inves- 17 This Bulletin, 2, p. 457; 1907. Carnegie Publication No. 65. 18 Physical Review, 30, p. 326; 1010. 644 Bulletin of the Bureau of Standards {Vol. 7, No. 4 tigated by this method of analysis. Thinking that further infor-mation would be disclosed, the investigation of this interest-ing mineral was undertaken anew, using samples of the samespecimen previously examined. 100% 90 80 70 60 2O S 50 z< DE I- 40 30 20 10. Fig. 9.—Muscovite Mica, H2KAlz{SiOA)z In the earlier work19 it was found that a sample of amphibole(probably hornblende) showed no traces of water, the smallabsorption band at being similar to that found in feldspars. Ill Carnegie Publication No. 65, p. 64. Cob lentz\ Water of Crystallization 645 O « ————— r 16 X <«-\ 0 0 JL O , w ^V c 3 b r V D m 0* bJO o NOISSIIAISNVdl 646 Bulletin of the Bureau of Sta?idards \vci. 7, No. 4 The sample of tremolite used in the present examination mm m thickness. The small absorption bands at are, therefore, not so sharp as found in the mm samplepreviously examined. On the assumption that 2 per cent ofwater was present, the equivalent layer of water (sp. gr. of tremo-lite is 3) is mm in thickness. The transmission of this sample before dehydration is given incurve a, figure 10. Curve b represents the t
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