Records of the Geological Survey of India, Volume 76, Issue 12Geological Survey of India, 1942 - Earthquakes |
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Page 14
... varies in colour from light to dark grey and possesses a marked conchoidal fracture . Uses . Flint is not much used in India as an abrasive although in some countries , Great Britain , for example , it is employed extensively in the ...
... varies in colour from light to dark grey and possesses a marked conchoidal fracture . Uses . Flint is not much used in India as an abrasive although in some countries , Great Britain , for example , it is employed extensively in the ...
Page 22
... varies from grey to green , blue or black . Its density varies from 3-12 to 3.22 and it possesses a brilliant lustre . Its hardness is about 9.5 and is therefore only slightly less than that of diamond . Silicon carbide was discovered ...
... varies from grey to green , blue or black . Its density varies from 3-12 to 3.22 and it possesses a brilliant lustre . Its hardness is about 9.5 and is therefore only slightly less than that of diamond . Silicon carbide was discovered ...
Page 24
... varies from 3.93 to 4.07 and it possesses a pearly lustre . Fused alumina is somewhat less hard than silicon carbide and its hardness varies from 9.2 to 9.6 . Uses . * Fused alumina is harder than corundum and can be used in all ...
... varies from 3.93 to 4.07 and it possesses a pearly lustre . Fused alumina is somewhat less hard than silicon carbide and its hardness varies from 9.2 to 9.6 . Uses . * Fused alumina is harder than corundum and can be used in all ...
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A. L. Coulson Abrasive Industry abrasive purposes Abrasive wheels Almandite aluminium artificial abrasives B. C. Roy bauxite beds Bihar Burma Canada Department Carborundum cent chert coated abrasives coated cloth coke colour corundum Corundum occurs crushed crystals Department of Mines Deposits Dhalbhum Diamond Diatomite Emery employed felspar flint Fused alumina future trend garnet garnet sands Geol Geological Survey glass grains grey grinding hard Hazaribagh district high grade honing stones impurities ingredients iron J. A. Dunn J. A. Mineral Resources Kashmir Kyanite large quantities limestone LXXVIII M. S. Krishnan Madras manufacture of abrasive manufactured abrasives Marketing and future Memoir metal polish mica Mysore natural abrasives oxide paper and cloth pebbles polishing material powders Products of Canada Pumice Resources of Bihar Rewa Risin spur rock sandstones siliceous silicon carbide sillimanite Singhbhum steel balls Steel wool suitable surfaces Surv Survey of India Talc Tripolite varies Vindhyan Volcanic dust