. Carnegie Institution of Washington publication. 54 INFRA-RED TRANSMISSION SPECTRA. GLAUBERITE (Na2SO*CaSOO. (Monoclinic; cleavage section parallel to c; transparent; t = Curve b, fig. 39). This is a mixture of two sulphates, of which the CaSO4 band at and /A have already been noticed. Glauberite has bands at 3, , , and /*. THENARDITE (Na2SO4). (Borax Lake, California. Orthorhombic; ground parallel to c; f = mm. Curve a, fig. 40.) This mineral was too brittle to grind successfully. It shows large bands at and 0/234567 FIG. 40. — Theuardite (a); Kiese
. Carnegie Institution of Washington publication. 54 INFRA-RED TRANSMISSION SPECTRA. GLAUBERITE (Na2SO*CaSOO. (Monoclinic; cleavage section parallel to c; transparent; t = Curve b, fig. 39). This is a mixture of two sulphates, of which the CaSO4 band at and /A have already been noticed. Glauberite has bands at 3, , , and /*. THENARDITE (Na2SO4). (Borax Lake, California. Orthorhombic; ground parallel to c; f = mm. Curve a, fig. 40.) This mineral was too brittle to grind successfully. It shows large bands at and 0/234567 FIG. 40. — Theuardite (a); Kieserite. KlESERITE(MgSO4). (Stassfurt Mines. Massive; subtranslucent; ( = mm. Curve b, fig. 40.) This mineral, like selenite, shows both water and SO4 bands. It is very opaque. The water bands at , 3, (complex with SO4), and p are prominent. There are two small bands at and 7^, respectively. CELESTITE (SrSO<). (From Lampasas, Texas. Cleavage parallel to c; transparent; t = mm. Curve a, fig. 41.) Celestite has absorption bands at , , and ,. The /u, band is conspicuous for its depth. ANGLESITE (PbSO<). (Monte Poni, Sardinia. Translucent; section parallel to m; ( = mm. Curve b, fig. 41.) The section used was not quite long enough to cover the slit. The lack of transparency was in part due to the fact that on account of its. 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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