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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 3425 px × 5138 px |
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