ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Light micrograph of a thin section through a pyroxene, one of a group of igneous rock-forming minerals. The specific type of this example is not known. The pyroxenes are mainly silicates of magnesium, calcium & iron. The most common member is augite, which is composed of magnesium, iron, aluminium & calcium. Other members include enstatine and hypersthene, diopside and aegerine. Pyroxene means "strange to fire", a title derived from an opinion that the minerals were only accidentally caught up in the lavas that contain them. Magnification: x11 at 6x6cm size.
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