HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Brown amphibole. Polarised light micrograph of a section of brown amphibole. This mineral contains magnesium and iron, often with traces of other elements, in a silicate matrix. It is found in igneous and metamorphic rocks. Magnification: x45 when printed at 10 centimetres wide.
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