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Comments on Gigapan: Amphibolite from Great Falls, MD

  2. Amphibolite similar to the amphibolite exposed on the Billy Goat Trail. Amphibolite is a metamorphic rock very rich in the mineral hornblende (an amphibole), which shows up black in this image. The white mineral in the rock is plagioclase feldspar. This is a very mafic metamorphic rock, with large crystals. Amphi...

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