. Carnegie Institution of Washington publication. WATER OF CONSTITUTION. 43 DATOLITE (Ca(BOH)SiCu). (Section ground to mm. Curve c, fig. 28.) In this curve the OH band at 3 p. is shifted to /*. The other bands present are at 2, 3, , and /*. Although the specimen was full of cracks, it is rather transparent for a boro-silicate. AZURITB ((OH)2). (Translucent; section parallel to c; £ = mm. thick. Fig. 29.) The section was ground from a group of crystals all of which were apparently piled parallel to c. There are absorption bands at , , , and ju. and
. Carnegie Institution of Washington publication. WATER OF CONSTITUTION. 43 DATOLITE (Ca(BOH)SiCu). (Section ground to mm. Curve c, fig. 28.) In this curve the OH band at 3 p. is shifted to /*. The other bands present are at 2, 3, , and /*. Although the specimen was full of cracks, it is rather transparent for a boro-silicate. AZURITB ((OH)2). (Translucent; section parallel to c; £ = mm. thick. Fig. 29.) The section was ground from a group of crystals all of which were apparently piled parallel to c. There are absorption bands at , , , and ju. and complete opacity beyond /*. The /A band is shifted slightly from the position common to substances containing OH a 4-56789 FIG. 29.—Brucite (a and b); Azurite. <0 BRUCITE (Mg(OH),). (From Woods Mine, Lancaster County, Pennsylvania. Foliated; massive; lamina parallel to c; { = and t = mm. Fig. 29.) As mentioned elsewhere, the fact that brucite did not show an absorption band at 3 //,, which is the maximum of the hydroxyl group in a series of organic compounds previously studied, made a reexamina- tion highly desirable. Of course, as will be noticed in curve b, by straining matters one might have concluded that the band at /*, which evidently is complex, containing the 3 /* band. In the present. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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