Igneous Rocks
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Igneous Rocks

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Igneous Rocks Presentation Transcript

  • 1. 1. Minerals A. can be liquids B. are organic C. are inorganic D. have no crystal structure 2. is a measure of how easily a mineral is scratched. A. luster B. cleavage C. hardness D. fracture 3. The color of a minerals powder on an unglazed porcelain tile is . A. luster B. hardness C. density D. streak 4. When halite breaks it displays . A. fracture B. cleavage C. luster D. crystal form 5. Halite forms crystals. A. triclinic B. monoclinic C. hexagonal D. cubic
  • 2. ReviewReview Minerals Identifying minerals
  • 3. Igneous RocksIgneous Rocks Rocks formed from melted minerals
  • 4. Igneous RocksIgneous Rocks Some have crystals Slow cooling = “large” crystals –Granite
  • 5. Granite
  • 6. Igneous RocksIgneous Rocks Fast cooling = “small” crystals - Basalt
  • 7. Basalt
  • 8. Granite Basalt
  • 9. Igneous RocksIgneous Rocks Extra fast cooling = no crystals
  • 10. Obsidian: Volcanic, “Glassy”
  • 11. Pumice: Volcanic, “Frothy”Pumice: Volcanic, “Frothy”
  • 12. Krakatoa Island 1883
  • 13. Pumice: Volcanic, “Frothy”
  • 14. Mt. St. Helens 1980