Hornblende crystals. This mineral contains calcium, sodium, magnesium, iron and aluminium in a silicate matrix. It is a member of the amphibole group

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Hornblende crystals. This mineral contains calcium, sodium, magnesium, iron and aluminium in a silicate matrix. It is a member of the amphibole group of minerals, and is found in igneous and metamorphic rocks. The area here is less than half a centimetre wide. Specimen found in Wolkenburg, Germany.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -life, aluminium, amphibole, black, chemical, chemistry, close-, crystal, crystalline, crystallised, crystallography, crystals, detail, earth, europe, european, geological, geology, german, germany, hornblende, iron, life, magnesium, mineral, mineralogy, minerals, rock, rocks, sample, science, silicate, silicates, specimen, wolkenburg