JAN HINSCH / SCIENCE PHOTO LIBRARY. JAN HINSCH / SCIENCE PHOTO LIBRARY.
Polarised light micrograph of a rock thin section of crystals of augite (silicates). Augite is found in volcanic & plutonic (igneous material of deep- seated origin) rocks. Its crystals are prismatic, appearing square or octagonal in cross section. Magnification: X20 at 35mm size.
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