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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°, 2Va=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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