Contact between Ortho-gneiss and Para-gneiss

Contact between Ortho-gneiss and Para-gneiss

by Metwally Hamza, Research Assistant in the field of geology with international published research papers. Academically interested in cosmic geology & planetary sciences. Geology fiend who likes to take photos of nature & geological features, Egypt

- para-gneiss is derived from sedimentary rocks.
- ortho-gneiss is derived from igneous rocks.
- the difference in the field outcropping between para-gneiss and ortho-gneiss is that para-gneiss is leucocratic to mesocratic "light-colored", but ortho-gneiss is melanocratic to hyper-melanic "dark-colored".

⁃ Taken and published by Geologist Metwally Hamza,
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