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adularia albite Albite and Pericline Albite twinning alkali feldspars An-content andesine angles anorthite anorthoclase anorthosite antiperthite atoms basalt bulk composition calcic Carlsbad twins chemical coefficients coexisting complex composition plane contain core correlation cryptoperthite crystals described diffraction diffusion distribution electron microprobe exsolution Geochemistry Geol gneisses grains granite granophyric graphic granite groundmass growth inclusions intergrowths iridescence irregular isotopes K-feldspar lamellae lattice Laves liquid low albite MacKenzie magma Manebach mechanical megacrysts metamorphic rocks metasomatism microcline microcline perthites microperthite minerals monoclinic myrmekite nepheline nucleation observed occur oligoclase optical orientation orthoclase oscillatory zoning parallel pegmatites Pericline twinning peristerite perthite phase phenocrysts plagioclase plutonic quartz range ratio recrystallization relations reported result rhombic section Ribbe sanidine Smith SMPM solution specimens structural suggested surface syenite Table temperature texture triclinic twin boundaries twin lamellae twin laws untwinned veins volcanic rocks X-ray