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abundant acid members Adelie Land Albite alkali felspar andalusite andesine Anorthite ANTARCTICA By C. E. antiperthite apatite appear areas augite bands C. E. TILLEY Cape Bruce character charnockite series clouded colour composition constituents are quartz contains cordierite crystals diameter dolerites dominant felspar Enderby Land enstatite-augite erratics feature felspar Flag locality foliated fractures fringe garnet gneisses Garnet-Granulite gneisses granitic granoblastic granoblastic quartz granodiorite granules granulitic granulitic quartz green biotite green hornblende hand specimens hornblende hypersthene igneous origin igneous rocks igneous textures inclusions intergrowth interstitial iron kyanite kyanite and andalusite labradorite LAND ANTARCTICA MacRobertson Land magnetite metamorphism metamorphosed microcline microperthite mineral myrmekite narrow zones occurs oligoclase-andesine orthoclase paragneisses perthitic Petrology plagioclase plates pleochroic polygonal grains potash felspar present prisms Proclamation Island pyroxene reheating rhombic pyroxene rocks collected ROCKS FROM ENDERBY schiller sections sedimentary derivation shearing sillimanite spindles twin typical vein Womersley zircon