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Stop 2 Precambrian granitic and amphibolite gneiss. Dark bands are amphibolite - composed of the minerals amphibole / biotite mica Light pink zones are granite - composed of quartz / potassium feldspar / muscovite mica To the left of the hammer is a small fold in the amphibolite. The amphibolite retains folds and other qualities of metamorphic rocks, whereas the granite appears to have crystallized from a melt, i.e. is of igneous origin. |
