. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figuke '1.—Occurrence of Nepkeline and Sodalite in Feldspar. l = Nepheline ; 2 = Sodalite. dance of apparent crystals in the hand-specimen, the thin section contains lid grains with idiomorphic forms. All have such shapes as are permitted them hy surrounding grains; so that we have in this feldspathic portion. Figure 3.—Eleolite Syenite from Red Jli". Tin- slide shows a portion of a basic accumulation consisting oi' biotite, hornblende, augite (rec- i tngular cleavage), sphene (stippled), and magnetite. of
. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figuke '1.—Occurrence of Nepkeline and Sodalite in Feldspar. l = Nepheline ; 2 = Sodalite. dance of apparent crystals in the hand-specimen, the thin section contains lid grains with idiomorphic forms. All have such shapes as are permitted them hy surrounding grains; so that we have in this feldspathic portion. Figure 3.—Eleolite Syenite from Red Jli". Tin- slide shows a portion of a basic accumulation consisting oi' biotite, hornblende, augite (rec- i tngular cleavage), sphene (stippled), and magnetite. of the rock an interpenetrating mass of large twinned grains, which have, however, a well marked extension in a single direction, and thus a. 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 Geological Society of America. [New York, etc. ] The Society
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