Other
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ineps..87..255d&link_type=abstract
Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, Volume 87, Issue 11, pp.255-261
Other
Fuchsites, 2-Layer Mica Structure, Sedimentary, Volcanic Exhalation
Scientific paper
The fuchsites described here occur in the lower portions of a precambrian quartzite bed, which typically encloses small bands and lenses of barvtes. Of the two fuchsites studied, one occurs in the main relatively fine grained quartziteand the other forming one of the small schistose segregations in the quartzite. White the commonly measured axial angles average 340 and 320, small angles of140 and 190, which are possibly related to the formation of the mineral under high pressure, have been recorded in both the fuchsites. There is a close similarity in x-ray powder pattern between the two fuchsite samples studied and between these and muscovite. This observation is in accordance with the interpretation that fuchsites exhibit the same two layered mica structure as muscovite 2M1. Chemically the fuchsites of Gattihosahalli are closely similar to the one reported from Manitoba and the cell contents are comparable to di-octahedral micas of muscovite character with Cr substituting for octahedarl Al. It is inferred that the fuchsites of Gattihosahalli are of sedimentary origin and the constituents required for their formation were all present in the shaly component of the sandstone or were partly or completely supplied by volcanic exhalations.
Anantha Murthy K. S.
Devaraju T. C.
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