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CERAMIC RAW MATERIALS
Physiographic Divisions of Sri Lanka
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alumina Average ball clay boehmite Boralesgamuwa brick and tile calcareous material cement ceramic ceramic industry china clay clay deposits clay materials Clay Mineral Provinces clay types clays examined clays studied Cordierite cottage brick d.t.a. curves Dry Zone areas Dry Zone clays Dry Zone types endotherm factories felspar fired fractions Ganga Geological gibbsite glaze goethite Group II clay halloysite Herath ilmenite Intermediate Zone Island kaolin kaolinite kaolinitic clays laterite lime limestone magnesite mainly manufacture mica micaceous material microns in diameter minerals present minor amounts mixed layer mixed layer mineral monazite montmorillonite non-clay minerals peak percent percentage plastic clay quartz Range raw materials refractory residual rock rutile samples examined sand sandy clay sedimentation shales showed shrinkage silicates sillimanite soils south-west sector Sri Lanka suitable Table temperature tile clays tile industry various varying vermiculite vitrification weathering Wet Zone area Wet Zone clays Wet Zone types