ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Gabbro. Polarised light micrograph of a thin section of gabbro, an igneous rock. Gabbro is coarse-grained, containing the minerals olivine and plagioclase feldspar. Olivine is recognised here by its irregular shaped crystals, with randomly oriented fractures. Plagioclase feldspar forms lath- shaped crystals. Specimen of rock obtained from the Bushveld range in the Transvaal, South Africa. Magnification: x8 at 6x7cm size.
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