geology: Olivine

Jun 28th, 2015
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1. Relief - moderate 2. Colour - colourless 3. RI - 1.635-1.875 4. Birefringence - 0.035-0.051 5. Interference colours - 3rd order 6. Extinction - straight 7. Comments - common alteration to serpentine group clay minerals

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OlivineNesosilicatesorthorhombic (-)Relief - moderateColour - colourlessRI - 1.635-1.875Birefringence - 0.035-0.051Interference colours - 3rd orderExtinction - straightComments - common alteration to serpentine group clay mineralsEuhedral phenocryst of olivineXPLbasalt, Thailandolivine phenocrysts in basaltXPLbasalt, Thailandphenocryst of olivineXPLbasalt, Thailandskeletal phenocryst of olivineXPLbasalt, Thailandanhedral olivine with minor alteration to serpentinite along fracturesPPLgabbroanhedral olivine with minor alteration to serpentinite along fracturesPPLgabbrofractured olivine phenocrysts, with alteration along the fracture planesPPL (left), XPL (right)Picrite, Margi, Cyprusfractured olivine phenocrysts, with alteration along the fracture planesXPLPicrite, Margi, Cyprusfractured olivine phenocrysts, with alteration along the fracture planesPPLPicrite, Margi, Cypruscumulate textures with olivineXPLduniteP3067cumulate textures with olivineXPLduniteP3067cumulate textures with olivineXPLduniteP3067cumulate textures with olivinePPLduniteP3067

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