048 Garnet Amphibolite

The garnet amphibolite is a compact, brownish to greenish grey, somewhat banded, medium size grained (0.1 to 0.2 mm) metamorphic rock formed through recrystallization under conditions of high viscosity and directed pressure. The metamorphism has considerably flattened and elongated the mineral grains to produce a banded texture, in between schistose and coarse grained. The material was recovered in a former copper mine located some kilometres to the east of Santiago de Compostela (A Coruña, Spain). Retreived from: Pérez-Rey, I., Arzúa, J., Barbiero, J., Alejano, L. R., & Walton, G. (2014, January). A lab-testing based geomechanical characterization of metamorphic rocks focusing on post-failure behavior. In ISRM Regional Symposium-EUROCK 2014. International Society for Rock Mechanics.