. Carnegie Institution of Washington publication. 6 8 9 IO n /<? FIG. 71.—Serpentine (a); Colemanite. AUJITE (NaAlSi8O8). (Curve a, fig. 72.) Section ground parallel to a cleavage plane. The curves of soda and potash feldspars are unusually similar, as was found for transmission. The maxima occur at , , and 10 6 B 9 10 FIG. 72.—Albite (a); Orthoclase. I3ju. ORTHOCLASE (var. ADULARIA) (KAlSisOs). (Curve b, fig. 72; cleavage parallel to c.~) The first maximum is shifted to p., while the second is a broad band, with a maximum at Please note that these images are extract

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. Carnegie Institution of Washington publication. 6 8 9 IO n /<? FIG. 71.—Serpentine (a); Colemanite. AUJITE (NaAlSi8O8). (Curve a, fig. 72.) Section ground parallel to a cleavage plane. The curves of soda and potash feldspars are unusually similar, as was found for transmission. The maxima occur at , , and 10 6 B 9 10 FIG. 72.—Albite (a); Orthoclase. I3ju. ORTHOCLASE (var. ADULARIA) (KAlSisOs). (Curve b, fig. 72; cleavage parallel to c.~) The first maximum is shifted to p., while the second is a broad band, with a maximum at 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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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1906