Polarised LM of thin section of gabbro

Polarised LM of thin section of gabbro

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Credit: JAN HINSCH/SCIENCE PHOTO LIBRARY

Caption: Polarised light micrograph of a thin section of gabbro, an igneous rock. Gabbro contains the minerals olivine & plagioclase feldspar. Olivine is recognised in the microscope by its numerous, randomly oriented fractures. Plagioclase feldspar forms lath-shaped crystals consisting of multiple twins. In this micrograph, these twins are seen in a variety of colours because a first-order red compensator plate, or "tint plate", has been placed in the microscope. Magnification: x6 at 35mm size. Ref: MICROCOSMOS, fig. 7.20, p. 138.

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Keywords: earth science, gabbro, geological, geology, light micrograph, olivine, plagioclase feldspar, rock, rocks

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