Retrograde eclogite, light micrograph

Retrograde eclogite, light micrograph

C001/9169 Rights Managed

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Retrograde eclogite rock. Polarised light micrograph showing how eclogite, a metamorphic rock formed at great depth under high pressure and temperature, may alter (become retrograde) when the conditions of its formation become less severe with time. Originally, the pyroxene crystals (coloured) were densely packed (see C001/9160), but now they are more widely spaced and less compressed. This image has been obtained using cross-polarised light (or 'crossed nichols').

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Keywords: colour, colourful, colours, cross polarised, cross-polarised, cross-polarized, crossed nichols, crystal, crystalline, crystals, deformed, earth science, eclogite, geological, geology, high pressure, high temperature, light micrograph, light microscope, lm, metamorphic, mineral, mineralogy, minerals, multicoloured, plm, polarised light micrograph, polarised light microscopy, polarized, polarized light micrograph, polarized light microscopy, pyroxene, retrograde, rock, rocks, section, sectioned, ultramafic

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