Gneiss and sphalerite breccia

Numéro d’image : 11595114
Gneiss and sphalerite breccia
Gneiss and sphalerite breccia. A brecciated rock is one that is composed of broken fragments of minerals or rock cemented together by a fine-grained matrix. This sample is composed of gneiss (grey) and sphalerite (dark) fragments. Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. Sphalerite is the chief ore of zinc. It consists largely of zinc sulphide in crystalline form but almost always contains variable amounts of iron
Licence : Droits gérés
Crédit: Science Photo Library / Wiersma, Dirk
Taille de l’image : 5138 px × 3425 px
Model Release : Non requis
Property Release : Non requis
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