ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
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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