geology : Perthites

Jun 28th, 2015
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Relief - low Colour - colourless RI - 1.518-1.539 Birefringence - 0.006-0.013 Interference colours - 1st order Extinction - inclined Comments - exsolution textures of sodic plagioclase in a K-feldspar host (the reverse are antiperthites)

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PerthitesFramework Silicatestriclinic (+,-)Relief - lowColour - colourlessRI - 1.518-1.539Birefringence - 0.006-0.013Interference colours - 1st orderExtinction - inclinedComments - exsolution textures of sodic plagioclase in a K-feldspar host (the reverse are antiperthites)Perthite with crystals of plagioclaseXPLPerthiteXPLPerthite, blebs are of albite-twinned plagioclaseXPLCarlsbad-twinned perthiteXPL

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