. Carnegie Institution of Washington publication. OLIGOCUASE-ANDESINU (aB3AN,). 91 to be alike in composition, there are rectangular sections, which at first appear to be cross-sections of square prisms with hollow centers, but are nearly equidimensional crystals which in some cases have prismatic prolongations. These rectangular crystals have rectangular spaces at the center, are twinned, and exhibit symmetrical extinction angles of about 300. As in other preparations of the more sodic feldspars, there are comparatively few small crystals of more calcic feldspar, approximately AbiAni, which b
. Carnegie Institution of Washington publication. OLIGOCUASE-ANDESINU (aB3AN,). 91 to be alike in composition, there are rectangular sections, which at first appear to be cross-sections of square prisms with hollow centers, but are nearly equidimensional crystals which in some cases have prismatic prolongations. These rectangular crystals have rectangular spaces at the center, are twinned, and exhibit symmetrical extinction angles of about 300. As in other preparations of the more sodic feldspars, there are comparatively few small crystals of more calcic feldspar, approximately AbiAni, which began to form in cuboidal shapes, but were followed by the crystallization of the bulk of the mixture in feldspars of the average composition. Ougoclase-AndESinE (Ab3Ani). (21). Colorless glass, without crystals in the thin section studied microscopically. (32). Colorless glass, with feldspar microlites and aggregates in the form of bundles about o. 1 mm. long and in crossed bundles and to some extent in spherulitic arrangements. The isolated microlites. 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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