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15 feet 50 feet abrasives acid alumina aluminium analyses average width band of magnetite barytes bauxite bricks calcined carbonate celestite cement grade cent charnockites chemical china clay chromite colour contain corundum crystalline limestone crystals deposit depth drilling estimated exposed feet thick feldspar furlongs furlongs north furlongs west garnet Geol Geological Survey Geology Branch gneisses Government grained graphite grey gypsum half a mile high grade limestone hill hillock ilmenite impure inches industries iron kankar KRISHNAN laterite length lignite lime limestone M. S. Krishnan Madras magnesite magnesium magnetite quartz rock manufacture material metal mica miles north miles south million tons mineral mining lease nodules north-east oxide pegmatites percentage phosphatic pits prospecting licence Ramanathapuram refractory Report road Salem district samples collected sand sandstones seen shales silica soil south-west specific gravity stone sulphur Surv Survey of India taluk three furlongs Tiruchirapalli district Unpublished variety veins village