Minerals of Madras: A Comprehensive and Up-to-date Guide to the Mineral Occurrences in Madras State |
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15 feet 50 feet abrasives acid AIYENGAR alumina aluminium analyses Arcot District average width band of magnetite barytes bauxite bricks calcite carbonate cement grade cent chemical china clay chromite coarse Coimbatore district colour contain corundum crystals deposit depth drilling estimated feet thick feldspar furlongs furlongs south furlongs west garnet Geol Geological Survey Geology Branch 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 south million tons mineral mining lease nodules oxide pegmatites percentage pits prospecting licence Ramanathapuram Ramanathapuram district refractory Report road Salem district samples collected sand sandstones seen shales silica South Arcot south-west specific gravity stone sulphur Surv Survey of India taluk three furlongs Tiruchirapalli district Unpublished variety veins village