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Aegirine from a tinguaite dyke near Harohalli, bangalore district, mysore state

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Proceedings / Indian Academy of Sciences

Abstract

Chemical and optical study of the green sodic pyroxene from a tinguaite dyke of the Harohalli area show that it is aegirine, rich in NaFe+3Si2O6 molecules (71%) having Nβ=1·776,γ−α=0·047, X Λ C=4–7°, 2V a =68°–73° and pleochroic with X=olive green, Y=pale green and Z=brown. The calculated chemical composition on the basis of 6 oxygen atoms is (Na, Ca, K)0.99 (Fe+3, Ti, Fe+2, Mn, Mg, [Al]0.98 Si2O6) which corresponds very closely with the ideal formula XYSi2O6.

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Authors and Affiliations

  1. Department of Geology, Karnatak University, Dharwar

    M. Ikramuddin & M. S. Sadashivaiah

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  1. M. Ikramuddin
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  2. M. S. Sadashivaiah
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Communicated by Prof. C. S. Pichamuthu,f.a.sc.

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Ikramuddin, M., Sadashivaiah, M.S. Aegirine from a tinguaite dyke near Harohalli, bangalore district, mysore state. Proc. Indian Acad. Sci. 64, 169–175 (1966). https://doi.org/10.1007/BF03052144

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  • DOI: https://doi.org/10.1007/BF03052144

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