How could you easily distinguish a black and white gneiss from a similar-colored granite?

Easy-peasy. Look for foliation on the gneiss. Granite is more massive. A gneiss will have foliation to it (1st pic) – parallel lines that are the result of a pressure/stress regime that forces the minerals to run perpendicular to the stress field. Granites that have not been subjected to a stress field will be massive […]
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