Minerals in rock sections; the practical methods of identifying minerals in rock sections with the microscope, especially arranged for students in technical and scientific schools . Orthoclase cleavage 65. — Basal. Fig. 66. — Clino pinacoid. formation with plagioclase (the orthoclase on the periphery).Also intergrown with quartz* forming pegmatite and micro-pegmatite, Fig. 67. Zonal structure often seen. Fig. 20, especially when decompo-

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkdvannostran