orthogneiss
Quick Summary
Orthogneiss is a type of gneiss, which is a metamorphic rock characterized by distinct banding. This banding is caused by the separation of light and dark minerals or by variations in grain size. Orthogneiss specifically originates from the metamorphism of igneous rocks, distinguishing it from paragneiss, which forms from sedimentary rocks. Gneiss is typically medium to coarse-grained and contains minerals like quartz and feldspar. The orientation of its banding can provide insights into the geological stresses present during its formation.123
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