DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Hornblende crystals in thin section, polarised light micrograph. This mineral contains calcium, sodium, magnesium, iron and aluminium in a silicate matrix. It is a member of the amphibole group of minerals, and it is found in igneous and metamorphic rocks. The area here is less than half a centimetre wide.
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