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The Compos1t1on of Erupt1ve Rocks
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acid aluminium anticlines augite basalt bedded rocks bedding planes boulders building stone calcite calcium carbonate card trays cement chemical clay cleavage coal coarse coarse-grained colour composition conglomerates constituent containing copper crystallisation crystals D.Sc decomposed deposits depth diorite dolerite dykes eruptive rocks fault feet felspar fissures FLEET LANE folds formation formed fossils gabbro garnet geological geologist give grains granite graphite gypsum hard horizontal hornblende hydroxide intrusion iron ironstones lava less leucite lime limestone LUDGATE CIRCUS magma magnesia magnesium magnetite marble massive rocks material metals metamorphic rocks metasilicate microscope minerals nearly nepheline olivine orthoclase outcrop oxide pegmatite peridotite petroleum plagioclase porosity porous potash present pressure Price pyrites quantity quartz salt sand sandstones sedi sediment sedimentary rocks serpentine shales shells silicates soda soil soluble solution specimens sulphides surface syenite synclines temperature thick Thomas Murby tion tourmaline tunnel veins volcanic water table weathering white mica