Records of the Geological Survey of India, Volume 76, Parts 9-14Government of India, 1947 - Geology Includes the "Annual report of the Geological Survey of India," 1867- |
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abrasive according alloys amount annual associated average belt beryl Beryllium Bihar block mica Canada cent Central cleavage colour compared consist contain copper corundum costs countries crystals deposits depth developed district Dunn electrical exported extensive feet felspar garnet Geol Geological Survey given grade granite green hardness heat important inches increase India industry insulation iron Italy known less lines Madras mainly manganese manganese-ore manufacture material metal miles mineral mines muscovite Nagpur normally obtained occur ore-bodies original oxide particularly pegmatites perhaps period phlogopite present principal probably production Provinces quality mica quartz range recent recorded replacement reported reserves river rocks ruby schists scrap sheet sizes solutions South splittings stained steel supplies surface Survey of India Table term thickness tons trade United usually vanadium variety various vary veins wide world's zone