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Rock Unit Study Guide FelsicMaficThermal / contact metamorphic rocksRegional metamorphic rocksIgneousSedimentaryMetamorphic- Of the 3 types of rock, which 2 do we have in Union County Pennsylvania? What causes visible crystals in igneous rocks? We learned 5 metamorphic rocks. Know all of their parent rocks. Metamorphic rock-----------Parent Rock 1. 2. 3. 4. 5. Be able to give at least 1 use for limestone, sandstone, gypsum, halite, coal What metals are the following ores mined for: MalachiteGalenaBauxiteOf the entire Earth, Pennsylvania has the largest deposit of what type of coal? Be able to identify all 19 of the rocks we learned in class by their name using your hand written answer key (1 sheet of paper).