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albite amphibolite analysis anomalies aplite associated aureole Austell Beds biotite Bodmin Moor Brammall and Harwood brown Carboniferous Carnmenellis cassiterite chlorite clay cliff coast Cornish country rock Cove crosscourses crystals Culm Dartmoor deposits described developed Devonian dolerite dykes elvan erosion surfaces evidence Exley facies fault fauna feldspar Flett fluorite foliation fossils gabbro geol geology Ghosh Gneiss goniatites gravity greenstones greisening horizon Hornblende hornfels Hosking hypothermal lodes igneous intrusion Kennack Gneiss Land's End Landewednack Landewednack Hornblende Schists limestones lithionite Lizard localities Lond Lower magma marine megacrysts metamorphism metasomatism mica mineralisation minerals mining muscovite North Devon occur origin outcrop overlying Palaeozoic pegmatite Penzance peridotite Pilton plagioclase platform porphyritic potash feldspar Proc Quarry quartz raised beach recorded region rhabdophane Schist sediments shales slates Society soils South Crofty south-west England specimens strike structure suggests texture tourmaline Trans Upper Devonian Ussher veins Wheal zone
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