Es6

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Es6

  1. 1. Igneous rocks pt. 3<br />
  2. 2. Some minerals that make up rocks<br />
  3. 3. feldspar<br />Very common in the earth’s crust. <br />
  4. 4. feldspar<br />
  5. 5. biotite<br />
  6. 6. hornblende<br />
  7. 7. olivine<br />
  8. 8. plagioclase<br />
  9. 9. granite<br />
  10. 10. granite<br />rock type: igneous<br />distinguishing features: completely crystallized, large, well formed interlocking crystals visible to the naked eye, no preferred crystal orientation, fairly light in color (white, gray, pink).<br />main minerals quartz, feldspar, biotite<br />weathering behavior : physical weathering can break the rock along its crystal boundaries<br />
  11. 11. granite is an igneous rock that forms by slow cooling of silica-rich magma deep within the earth<br />
  12. 12. basalt<br />
  13. 13. basalt<br />Basalt is an igneous rock that forms through rapid cooling at the surface of the earth. The island of hawaii, for example is almost entirely made from basaltic lava flows.<br />weathering of iron minerals can turn the surface tan or reddish brown (see image below<br />
  14. 14. basalt<br />
  15. 15. Obsidian<br />Volcanic glass of the granite family. Cleavage or fracture? (conchoidal)<br />
  16. 16. Rhyolite<br />also in the granite family<br />
  17. 17. rhyolite<br />
  18. 18. rhyolite<br />Rhyolite is a light-colored, fine-grained, extrusive igneous rock that typically contains quartz and feldspar minerals. <br />
  19. 19. So what makes a granite rock?<br />Rocks are made of minerals.<br />Granite rocks are made of quartz, feldspar, and at least one other mineral.<br />
  20. 20. pumice<br />
  21. 21. basalt<br />Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene.<br />Basalt is also abundant on the moon!<br />
  22. 22. basalt<br />
  23. 23. gabbro<br />
  24. 24. Gabbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, augite and sometimes olivine. <br />
  25. 25. diorite<br />
  26. 26. diorite<br />Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende and sometimes quartz. <br />
  27. 27. PORPHYRITIC ROCKS<br />Extrusive AND intrusive!<br />
  28. 28. Porphyritic rocks<br />Rocks that have two distinctly different textures: large crystals AND fine-grained crystals. <br />
  29. 29. Porphyritic rock<br />
  30. 30. Porphyritic rocks<br />A theory of how porphyritic rocks are formed:<br />Magma cools slowly deep inside the earth. Large crystals are able to form.<br />THEN, the remaining liquid magma is pushed upward until close to the surface of the earth. <br />Forms fine crystals. <br />
  31. 31. Porphyritic rock<br />
  32. 32. Porphyritic granite<br />

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