. Radiometric investigation of water of crystallization, light filters and standard absorption bands . milarity with fructose which has no crystal water) to suggestthe presence of a molecule of water of crystallization. It seems rather remarkable that out of a sum total of more than60 substances examined radiometrically only two (perhaps onlyone) were found which did not agree with the other classificationinto water of crystallization and water of constitution. VII. NEW EXPERIMENTAL DATAGROUP 1. MINERALS CONTAINING WATER OF CRYSTALLIZATION Under this heading are described the characteristics o
. Radiometric investigation of water of crystallization, light filters and standard absorption bands . milarity with fructose which has no crystal water) to suggestthe presence of a molecule of water of crystallization. It seems rather remarkable that out of a sum total of more than60 substances examined radiometrically only two (perhaps onlyone) were found which did not agree with the other classificationinto water of crystallization and water of constitution. VII. NEW EXPERIMENTAL DATAGROUP 1. MINERALS CONTAINING WATER OF CRYSTALLIZATION Under this heading are described the characteristics of severalcrystalline and amorphous substances containing water. For, asalready mentioned, the radiometric test finds no distinctionbetween water of crystallization, absorbed water, or water in solidsolution. Water, H20.—In order to appreciate fully the significance of thedata to be presented on minerals, it is necessary to describe thecharacteristics of water when examined in the liquid and in the 10 Clarke and Schneider: Amer. Jour. Sci., 40, p. 308; 1890. Coblentz] Water of Crystallization 63J. o NOISSIlAlSNVdl 632 Bulletin of the Bureau of Standards \, vapor state. All observers11 agree in their location of largeabsorption bands of water at the approximate wave lengths , 2,3, , and 6ft All have found that water is extremely opaqueto the deep infra-red radiation, so that the film had to be reducedto a few thousandths of a millimeter in thickness in order to beable to study it at all. In fact, of all the substances examined, which includes all thegreat groups of chemically related compounds, water standsunique in having a spectrum of numerous narrow absorptionbands, which can be resolved only when the substance is reducedto a highly attenuated vapor. In the liquid state these groups ofsmall bands coalesce into large bands as indicated in figure 1. Itis of course well known that a very thick layer of water is requiredto produce absorption in the visible spect
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