Polarised LM of thin section of gabbro

Polarised LM of thin section of gabbro

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Polarised light micrograph of a thin section of gabbro, an igneous rock. This is a type of coarse-grained gabbro, showing mainly feldspar with randomly orientated fractures of lath- shaped crystals and olivine. 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. Horizontal object size of this section: 3.0 mm.

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Keywords: crystal, earth science, eucrite, gabbro, geological, geology, igneous, light, light micrograph, olivine, plagioclase feldspar, polarised, polarized, rock, rocks, thin section

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