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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Page 18
... replacement by albite , even in those pegmatites which occur in granite some of the potash felspar crystallised later than albite . Some veins have been formed along faults , and these as a rule possess a thick massive quartz core ...
... replacement by albite , even in those pegmatites which occur in granite some of the potash felspar crystallised later than albite . Some veins have been formed along faults , and these as a rule possess a thick massive quartz core ...
Page 19
... replacement masses , and may or may not contain cores of massive quartz . Presumably the solutions soaked irregularly through the schists , replacing and recrystallising them . Certain veins follow the close folding in the schists . It ...
... replacement masses , and may or may not contain cores of massive quartz . Presumably the solutions soaked irregularly through the schists , replacing and recrystallising them . Certain veins follow the close folding in the schists . It ...
Page 27
... replacement deposits yield about 50 per cent . of the total production , but vein deposits are the most numerous . Perhaps the largest producer is the Ashio mine working a copper - zinc vein in liparite and Paleozoic rocks , and ...
... replacement deposits yield about 50 per cent . of the total production , but vein deposits are the most numerous . Perhaps the largest producer is the Ashio mine working a copper - zinc vein in liparite and Paleozoic rocks , and ...
Contents
GENERAL | 1 |
THE MODE OF OCCURRENCE | 8 |
Indian provincial production of manganese | 12 |
13 other sections not shown
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abrasive albite alloys amount annual average B. C. Roy belt beryl Beryllium Bihar block mica Bombay braunite Brazil built-up mica Calcutta Canada cent Central Provinces chalcocite chalcopyrite cleavage colour condenser films containing copper copper deposits corundum countries crystals deposits occur district dressed mica electrical exports fair stained feet felspar ferromanganese garnet Geol Geological Survey gonditic granite Heavily stained important inches India insulation iron and steel iron-ores J. A. Dunn known Kodarma limestone lode M. S. Krishnan Madras mainly manganese manganese-ore manufacture metal mica industry mica-schists micanite miles million tons Mineral Resources mines muscovite Mysore obtained ore-bodies oxide pegmatites phlogopite plate production psilomelane pyrolusite quality block quality mica quartz Rajputana recent replacement rocks ruby Sandur schists sheet mica silicate Singhbhum sizes smelting South splittings sulphide surface Surv Survey of India Table thickness United vanadium veins world's