JAN HINSCH / SCIENCE PHOTO LIBRARY. JAN HINSCH / SCIENCE PHOTO LIBRARY.
Polarised light micrograph of a rock thin section showing quartz crystals in a mica surround. Quartz is one of the commonest minerals of the earth's crust, representing some 12 percent by volume. It crystallizes directly from igneous magma. Magnification X6 (at 35mm size).
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