Records of the Geological Survey of India, Volume 76, Part 10Geological Survey of India, 1942 - Earthquakes |
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Page 5
... proportions of magnesia and iron ; a little soda , calcium and lithia may be present and very rarely fluorine . All contain combined water . The mica principally used in commerce is muscovite , the potash mica , which has the ...
... proportions of magnesia and iron ; a little soda , calcium and lithia may be present and very rarely fluorine . All contain combined water . The mica principally used in commerce is muscovite , the potash mica , which has the ...
Page 55
... proportion of Rajputana mica is converted into splittings than is the case with Bihar mica , perhaps 90 percent . Only 2 percent can be regarded as of high quality , and only a little of the remainder is shipped as block . It is ...
... proportion of Rajputana mica is converted into splittings than is the case with Bihar mica , perhaps 90 percent . Only 2 percent can be regarded as of high quality , and only a little of the remainder is shipped as block . It is ...
Page 61
... proportion is stolen mica . Mica is sold locally either in the crude form , as mixed cut block ( bima ) , or as sorted block . Some of even the larger mining concerns have decided in recent years that it does not pay them to cut and ...
... proportion is stolen mica . Mica is sold locally either in the crude form , as mixed cut block ( bima ) , or as sorted block . Some of even the larger mining concerns have decided in recent years that it does not pay them to cut and ...
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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