A new occurrence of mahadevite

  • E. Venkayya


Samples of mica similar to Mahadevite sent by Messrs. Krishna Crucible Company of Mamidada from the East Godavari District, were studied optically and were chemically analysed. The percussion figure indicates its affinity to the muscovite group. The mica is optically negative, the apparent optic axial angle being about 14°. The molecular formula has been calculated from the analysis and it is shown that this mica has an intermediate position between muscovite and phlogopite. Ramasehan’s observation that this mica is a distinct species and not an alteration product of any other mica is confirmed.


Ferric Iron Equal Proportion Alteration Product Molecular Proportion Interference Figure 
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  1. Ramaseshan, S. “Mahadevite—A New Species of Mica”Proc. Ind. Acad. Sci., 1945,22 A, 177–181.Google Scholar
  2. Winchell, A. N. “Elements of Optical Mineralogy,” Part II, John Wiley & Sons, Inc., New York (1945).Google Scholar

Copyright information

© Indian Academy of Sciences 1949

Authors and Affiliations

  • E. Venkayya

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