. Carnegie Institution of Washington publication. 44 INFRA-RED TRANSMISSION SPECTRA, Siderite (FeCOs). (From Allevardj France. Cleavage piece; < = mm.; grayish color; translucent to transparent. Fig. 27.) This specimen was examined in connection with the carbonates pre- viously studied. The complex band, with maxima at , , and /*, is in common with the other carbonates. In a very thin section of calcite 25% 20 c o " .52 IS £ (0 C £/0 I- / ^ \ 1 I - \ / \ / \ Vs. / \ â \ 2 3 4- Fig. 27. â Siderite. 6/i (CaC03) this region was resolved into sharp bands, having maxima at 3
. Carnegie Institution of Washington publication. 44 INFRA-RED TRANSMISSION SPECTRA, Siderite (FeCOs). (From Allevardj France. Cleavage piece; < = mm.; grayish color; translucent to transparent. Fig. 27.) This specimen was examined in connection with the carbonates pre- viously studied. The complex band, with maxima at , , and /*, is in common with the other carbonates. In a very thin section of calcite 25% 20 c o " .52 IS £ (0 C £/0 I- / ^ \ 1 I - \ / \ / \ Vs. / \ â \ 2 3 4- Fig. 27. â Siderite. 6/i (CaC03) this region was resolved into sharp bands, having maxima at , , and ix. This sample furnishes additional proof that the large groups of chemically homologous compounds have similar absorption spectra. WULFENITE (PbMo04). (From Red Cloud Mine, Yuma County, Arizona. Deep-yellow color; t = mm. Curve a, fig. 28.) This mineral is of interest in connection with a study of the oxides, e. g., Ti02, Si02, etc. The transmission curve a, fig. 24, shows wide 30 25 C20 ,0 V) 'E 15 w c <d. 2 3 4-567 Fig. 28. â Wulfenite (a); Phosphorus. IOJLL absorption bands at and ^, and complete opacity beyond 9 /*, where there is a band of metallic 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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