Contact between Ortho-gneiss and Para-gneiss
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Contact between Ortho-gneiss and Para-gneiss

by Metwally Hamza, Egyptian Geologist, 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".

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⁃ Taken and published by Geologist Metwally Hamza,
⁃ Academia: benha.academia.edu/MetwallyHamza
⁃ Let's Connect: linkedin.com/in/metwallyhamza