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 17
... thickness from a fraction of an inch to over 100 feet . The thicker veins almost invariably have a quartz core , the felspar and mica being arranged on either side of this core . Some huge veins consist of quartz with a narrow zone of ...
... thickness from a fraction of an inch to over 100 feet . The thicker veins almost invariably have a quartz core , the felspar and mica being arranged on either side of this core . Some huge veins consist of quartz with a narrow zone of ...
Page 31
... thickness by micrometre . As many as forty or fifty splittings may go to form one book , which represents an original block ; as each splitting is stripped off it is dusted with a small bag of fine mica powder ( ground locally in small ...
... thickness by micrometre . As many as forty or fifty splittings may go to form one book , which represents an original block ; as each splitting is stripped off it is dusted with a small bag of fine mica powder ( ground locally in small ...
Page 38
... thickness , and their work is checked by micrometer . In America each film is tested on an electrically - charged plate by touching with an electrode and nothing the colour and type of sparks emitted . When it is remembered that ...
... thickness , and their work is checked by micrometer . In America each film is tested on an electrically - charged plate by touching with an electrode and nothing the colour and type of sparks emitted . When it is remembered that ...
Contents
GENERAL | 1 |
THE MODE OF OCCURRENCE | 8 |
Indian provincial production of manganese | 12 |
13 other sections not shown
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Common terms and phrases
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