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How can you distinguish between granite and gneiss?
1) the gneiss will have separation of light and dark minerals
2) The crystals in the granite are distinct while those in gneiss will seem to be compressed or smeared in to layers.
3) The mineral garnet is only formed in metamorphic environments, not igneous, thus the presence of garnets distinguished the sample is a gneiss.
4) the granite will have separation of light and dark minerals
5) The crystals in the gneiss are distinct while those in granite will seem to be compressed or smeared in to layers