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263027686274175 263027686274175 Presentation Transcript

  • Minerals, Rocks and Fossils
  • What is a mineral?
    • Naturally occurring
    • Non-organic
    • Characteristic chemical composition
    • Distinctive physical properties
    • Crystalline structure
  • Mineral properties
    • Color
    • Luster
    • Habit (Shape)
    • Cleavage & Fracture
    • Streak
    • Hardness
    • Other
  • Color:
    • Not mineral specific
  • Luster:
    • How minerals reflect light
    Non-metallic Metallic
  • Mineral Habit (Shape)
    • Shape a mineral takes if grown unimpeded
    • Mineral Java Applet
  • Cleavage & Fracture
    • Cleavage: planes of weakness along which minerals can break
    • Fracture: surfaces along which minerals can break
  • Cleavage & Fracture Best identified on a fracture surface
  • Streak:
    • The powdered form of a mineral
  • Hardness:
    • Based on Moh’s scale of hardness
  • Other Properties
    • Specific gravity
    • Reaction to acid
    • Striations
    • Magnetism
  • Classifying Rocks
    • Rocks are classified by how they formed and what they’re made of
    • There are 3 general classes of rocks
    • Igneous Rocks …are formed when lava and magma crystallize to form solid rock
    • Metamorphic Rocks …are formed when an existing rock is partially melted, squeezed, or both
    • Sedimentary Rocks …are formed when sediments (sand clay, and silt) are compressed and become solid rock
  • Igneous Rocks
  • Metamorphic Rocks Gneiss Schist
  • Sedimentary Rocks Shale Conglomerate Sandstone
  • Fossils The remains or imprints of living things of the past found in Sedimentary rocks.
  • Fossils provide information about life and conditions in the past.
  • Fossils of Sea Creatures
    • Oceans once covered the area
    • What part of the ocean
  • Fossils of Plants
    • Plant fossils can tell us about the ancient environment
  • Animal Fossils
    • Animal fossils can tell us
      • About past environments
      • What the animal ate
      • How they lived