Mahadevite-a new species of mica

Ramaseshan, S. (1945) Mahadevite-a new species of mica Proceedings of the Indian Academy of Sciences, Section A, 22 (3). pp. 177-181. ISSN 0370-0089

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The physical properties and chemical composition of a species of mica from the Warangal district in Hyderabad have been studied. Thick sheets are bronze-coloured and opaque, while thin sheets transmit light of a greenish yellow tint, the pleochroism being weak but distinct. The optic axial angle is 13° 48'. Th plane of the optic axes is perpendicular to the plane of symmetry. The composition is SiO2 38·98%, Al2O3 29·94%, Fe2O3 and FeO 4·12%, Mgo 13·2%, K2O 9·6% water 3·8%. On the basis of Pauling’s model of the mica structure, the numbers of atoms of various elements in six, and twelve co-ordination positions are calculated. Approximately equal number of Al and Mg atoms are found in six co-ordination. The mica appears to be of a type intermediate between muscovite and phlogopite.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:35139
Deposited On:17 Apr 2011 14:13
Last Modified:17 May 2016 18:03

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