Records of the Geological Survey of India, Volume 76, Part 10Geological Survey of India, 1942 - Earthquakes |
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Page 6
... various shades of ruby , pink , brownish red , brown , yellowish or even green . The Bihar mica , most used in commerce , is of deep ruby colour . Phlogopite is much darker in colour , and even the thinnest films invariably show some ...
... various shades of ruby , pink , brownish red , brown , yellowish or even green . The Bihar mica , most used in commerce , is of deep ruby colour . Phlogopite is much darker in colour , and even the thinnest films invariably show some ...
Page 50
... VARIOUS GRADES PRODUCED . Production statistics do not discriminate between mica of various qualities . Even for individual companies it is impossible , in certain cases , to determine the average quality of their production ; some ...
... VARIOUS GRADES PRODUCED . Production statistics do not discriminate between mica of various qualities . Even for individual companies it is impossible , in certain cases , to determine the average quality of their production ; some ...
Page 55
... various qualities and sizes of a single firm during a considerable period . In Table 12 production figures for total dressed mica from known sources in Bihar are given . Using the above estimates of the per- centages of various grades ...
... various qualities and sizes of a single firm during a considerable period . In Table 12 production figures for total dressed mica from known sources in Bihar are given . Using the above estimates of the per- centages of various grades ...
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Common terms and phrases
2nd quality albite amount approximately average Bihar Bihar mica Black dotted Black spotted block and splittings block mica built-up mica Calcutta Canada cleavage condenser films condenser plates countries country rock crude mica dealers diopside district electrical exported block feet felspar Geological Survey Giridih grade granite ground mica Heavily stained 1st high quality mica India Indian mica insulation Intermediate stained J. A. Dunn Kodarma Kodarma Reserved Forest large number larger sizes Lepidolite loose splittings M. S. Krishnan Madagascar Madras mainly manufacture mica belt mica exported mica industry mica mining mica produced mica splittings mica trade mica-schists micanite microcline miles muscovite obtained pegmatites percentage phlogopite potash felspar pyroxenite quality block mica quartz quartz core Rajputana Rajputana mica recent recorded ruby mica schists scrap mica sheet mica Short tons smaller solutions South stained 1st quality stoping Survey of India Table 13 trimmed United uparchalla veins washers