Orthoclase

Jun 28th, 2015
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Relief - low Colour - colourless RI - 1.518-1.539 Birefringence - 0.006-0.012 Interference colours - 1st order Extinction - inclined Comments - Often shows simple 'Carlsbad' twinning; alters to the clay minerals illite, kaolinite and montmorrillonite.

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OrthoclaseFramework Silicatestriclinic (+,-)Relief - lowColour - colourlessRI - 1.518-1.539Birefringence - 0.006-0.012Interference colours - 1st orderExtinction - inclinedComments - Often shows simple 'Carlsbad' twinning; alters to the clay minerals illite, kaolinite and montmorrillonite.Carlsbad twinned crystal of orthoclaseXPLFish Canyon TuffFragments of orthoclase, showing concentric zoningXPLFish Canyon Tuffzoned crystal of orthoclaseXPLFish Canyon TuffSieve-textured orthoclase; alteration to clay mineralsXPL

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