Explanation
A regional metamorphic rock consisting of plagioclase and common amphibole. The content of plagioclase and amphibole is similar, and there is almost no quartze. Sometimes it contains a small amount of epidote, diopside, garnet or biotite. Columnar granite balastic texture, gneissic, massive or banded structure. Those with clear schistosity are called plagioclase hornblende schist; amphibolite or hornblende schist refers to those with less plagioclase and mainly amphibole. Those with similar contents of quartze, plagioclase and amphibole are called hornblende plagioclase gneiss. It is metamorphosed from basic volcanic rock, greywacke, tuff or mafic marl.
Classification
Natural materials and products -> Mineral materials