Staurolite crystal, light micrograph

Staurolite crystal, light micrograph

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Caption: Staurolite crystal. Polarised light micrograph of a large staurolite crystal, also known as a porphyroblast, embedded in a micaceous matrix. This crystal was formed later than the host rock itself. After its formation, the staurolite crystal reacted with its surrounding host rock to form a conversion ring of biotite crystals around its periphery. This image has been obtained using cross-polarised light (or 'crossed nichols').

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Keywords: biotite, conversion ring, cross polarised, cross-polarised, cross-polarized, crossed nichols, crystal, crystalline, crystals, earth science, geological, geology, host rock, light micrograph, light microscope, lm, micaceous matrix, mineral, mineralogy, minerals, plm, polarised light micrograph, polarised light microscopy, polarized, polarized light micrograph, polarized light microscopy, porphyroblast, rock, rocks, section, sectioned, staurolite

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