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Download Igneous Rocks II - Mr. Collins` Science
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Name:_______________ Period:_________ Igneous Rocks II 1. Name four felsic igneous rocks. _________ _________ _________ 2. Name four mafic igneous rocks. _________ _________ _________ 3. Name a plutonic, mafic igneous rock. _________ _________ 4. Which igneous rock cooled slowly under ground and contains mostly quartz and potassium feldspar? __________________ 5. As igneous rocks become more mafic, they also become (color) __________________ 6. As igneous rocks become more felsic, they also become (density) __________________ 7. Which igneous rock is fine-grained and has a lot of pyroxene? __________________ 8. Name a coarse-grained igneous rock composed mainly of olivine. __________________ 9. Name an intrusive, dense and dark-colored igneous rock. __________________ 10. Igneous rocks are classified mainly by their_____________ 11. One can determine where an igneous rock formed by observing the__________________ More questions on the other side. Use your Handy Dandy Earth Science Reference Tables to fill in the blank spaces in the table. Rock Formed Cooling Crystal Texture Rhyolite Gabbro Basalt Pumice Obsidian Granite from Lava rate size Small Slow Fast Lava Coarse Fine No crystals Very fast Magma Glassy Large 1. Look directly under the “i” in Peridotite and list the percentages of each mineral below. Potassium Feldspar _______ Quartz _______ Plagioclase Feldspar _______ Biotite Mica _______ Amphibole (Hornblende) _______ Pyroxene _______ Olivine _______ 2. What are the percentages of each of the following minerals in the lightest sample of Scoria? Potassium Feldspar _______ Quartz _______ Plagioclase Feldspar _______ Biotite Mica _______ Amphibole (Hornblende) _______ Pyroxene _______ Olivine _______ 3. What are the percentages of each of the following minerals in Diorite Potassium Feldspar _______ Quartz _______ Plagioclase Feldspar _______ Biotite Mica _______ Amphibole (Hornblende) _______ Pyroxene _______ Olivine _______ 4. What is another name for Dunite? _________________ 5. What are the percentages of each of the following minerals in Granite Potassium Feldspar _______ Quartz _______ Plagioclase Feldspar _______ Biotite Mica _______ Amphibole (Hornblende) _______ Pyroxene _______ Olivine _______
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