Igneous Rocks

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Igneous Rocks (classification and identification)

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Igneous Rocks

  1. 1. Igneous Rocks Are grouped by mineral composition and texture
  2. 2. 1. Texture <ul><li>Size and arrangement of mineral crystals </li></ul><ul><li>igneous crystals often interlocking </li></ul>
  3. 3. A. Intrusive Texture <ul><li>Intrusive: formed underground from magma that cooled SLOWLY </li></ul><ul><li>large, easily seen crystals </li></ul>
  4. 4. Intrusive- coarse- plutonic
  5. 5. Igneous rocks w/ large crystals are known as: <ul><li>Intrusive= </li></ul><ul><li>plutonic= </li></ul><ul><li>coarse-grained </li></ul><ul><ul><li>ex: granite </li></ul></ul>
  6. 6. Granite
  7. 7. Intrusive-Plutonic-Coarse Grained Granite
  8. 8. B. Extrusive Texture <ul><li>Extrusive: formed above ground from lava that cooled QUICKLY </li></ul><ul><li>small crystals, often hard to see </li></ul>
  9. 9. Igneous rocks w/ small crystals are known as: <ul><li>extrusive= </li></ul><ul><li>volcanic= </li></ul><ul><li>fine-grained </li></ul><ul><ul><li>ex: basalt, </li></ul></ul><ul><ul><li>rhyolite </li></ul></ul>Rhyolite : Extrusive Fine Grained Volcanic
  10. 10. Basalt: <ul><li>Extrusive </li></ul><ul><li>Fine Grained </li></ul><ul><li>Volcanic </li></ul>
  11. 11. 2. Composition <ul><li>Is the mineral content </li></ul><ul><li>often shown as color of rock </li></ul>
  12. 12. A. Felsic <ul><li>Felsic rocks </li></ul><ul><ul><li>are light colored </li></ul></ul><ul><ul><li>have hi silica content </li></ul></ul><ul><ul><li>most intrusive rox are felsic </li></ul></ul>
  13. 13. felsic <ul><li>Granite </li></ul><ul><li>Rhyolite </li></ul>
  14. 14. B. Mafic <ul><li>Mafic rocks are: </li></ul><ul><ul><li>dark colored </li></ul></ul><ul><ul><li>low in silica </li></ul></ul><ul><ul><li>most extrusive rocks are mafic </li></ul></ul><ul><ul><ul><li>ex: basalt </li></ul></ul></ul>
  15. 15. Basalt
  16. 16. Some igneous rocks are hard to classify: <ul><li>Obsidian: glassy </li></ul>
  17. 17. Porphyritic: full of holes <ul><li>porphyritic </li></ul>
  18. 18. <ul><li>pumice: full of holes; floats </li></ul><ul><li>scoria: full of holes; doesn’t float </li></ul>
  19. 19. Floating Pumice
  20. 20. Scoria
  21. 22. Click on Picture Below for Animation and Go Through Each Page. Answer the Questions as You Go.

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