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Igneous Rock Notes. Igneous rock forms when magma cools and solidifies. Classification. Composition Felisc or Mafic Texture Intrusive or Extrusive. Classification. Granite. Felsic – light colored, less dense Rich in aluminum, potassium, silicon, and sodium. Rhyolite. Classification.
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Classification • Composition • Felisc or Mafic • Texture • Intrusive or Extrusive
Classification Granite • Felsic – light colored, less dense • Rich in aluminum, potassium, silicon, and sodium. Rhyolite
Classification Gabbro • Mafic – dark colored, more dense • Rich in calcium, iron, and magnesium Basalt
Texture • Intrusive Igenous Rock – inside Earth’s crust (corase-grained)
Texture • Intrusive Igneous Rock Formations • Pluton: Large, irregular shaped intrusive bodies • Batholiths: The largest of all igneous intrusions • Stocks: Intrusive bodies that are exposed over smaller areas than batholiths • Dikes: Sheetlike intrusions that cut across previous rock units • Laccolith: Sheetlike intrusions that are oriented parallel to previous rock units • Volcanic neck: A column of igneous rock formed when magma hardens with in a vent
Texture • ExtrusiveIgenous Rock – on Earth’s surface (fine-grained)
Texture • Extrusive Igneous Rock Formations • Lava Flow:Formed when lava erupts from a volcano • Fissure: Long cracks in Earth’s crust where lava can flow
Igneous Rock Flow Chart igneous rock rock melts rock cools Slow cooling (coarse-grained) pressure composition temperature Fast cooling (fine-grained)