Orthopyroxene

Jun 28th, 2015
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1. pyroxenes; Single-chain Silicates 2. orthorhombic (+,-) 3. Relief - moderate 4. Colour - colourles, very wekly coloured green/pink 5. RI - 1.658-1.788 6. Birefringence - 0.008-0.020 7. Interference colours - 2rd order 8. Extinction - straight, complete

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Orthopyroxenepyroxenes; Single-chain Silicatesorthorhombic (+,-)Relief - moderateColour - colourles, very wekly coloured green/pinkRI - 1.658-1.788Birefringence - 0.008-0.020Interference colours - 2rd orderExtinction - straight, completeCommentseuhedral basal section of orthopyroxenePPLbasaltEuhedral, acicular crystals of orthopyroxenePPLbasaltsubhedral glomerocryst of orthopyroxenePPLbasalteuhedral, elongate phenocryst of orthopyroxene, seen in PPL (left) and XPL (right)basaltExsolution Texturesorthopyroxene host with blebs of clinopyroxene in PPL (left) and XPL (right). Note the different extinction positions of the two phasesThe crystal above seen in XPL, and rotated so that the orthopyroxene is in (straight) extinction, whilst the clibnopyroxene, with inclined extinction is fully illuminated

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