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abundance actinolite albite alkali feldspar alteration of ilmenite andesine apatite appearance arenaceous Becket gneiss biotite chiefly chlorite considerable crystals cyanite Diorite or Basic distinctly gneissose epidote essentially of hornblende feldspar present feldspar shows garnet garnet and staurolite Geological gneisses and schists gneissose texture grained granite bathylite Granite or Acid granulation Graphitic hand specimen Hise hornblende and biotite igneous ilmenite and sphene ilmenite to rutile l/4 miles lamellae leucoxene Litchfield Litchfield county magnetite metamorphic minerals mica mica present mica schist microcline microscope hornblende microscope the rock mile southeast miles south muscovite muscovite and biotite Ordinary light orthoclase pegmatite plagioclase Plate pre-cambrian present as accessories quantity quartz and feldspar quartzite rock is seen rock shows rutile schists and gneisses secondary quartz shows the effect south of Thomaston southeast of Morris specimen this rock staurolite talc Thomaston Torrington tourmaline tremolite True granite typical granitic untwinned feldspar upper zone zircon zoisite
Page 32 - ... composition to the normal granite. They are much coarser grained and far more numerous than the pegmatites which accompany the Quincy granite. The rocks into which the Andover granite has been intruded are cut by numerous small masses and irregular dikes of an alaskitic granite composed essentially of feldspar and quartz. The feldspar is orthoclase, microcline, and albite. The alaskites are uniformly gneissic and weather red. Alteration. — Although gneissic and usually more altered than the...