Pyrolusite crystals. Pyrolusite is a mineral consisting mainly of manganese dioxide. It is an important ore of manganese. This specimen measures 85mm across and was found in Ilfeld in the Harz Mountains,Germany | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5197 px × 3465 px |
Model Release : | Non requis |
Restrictions : | - |