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Earth Science: Identify minerals
 

Earth Science: Identify minerals

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Notes from 10/14/10

Notes from 10/14/10

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    Earth Science: Identify minerals Earth Science: Identify minerals Presentation Transcript

    • Minerals
    • What is a mineral?
      • A mineral is a natural solid that was never living.
      • Minerals are NOT rocks.
      • Minerals are formed by pressure, temperature, and time.
    • How can we identify minerals?
    • How can we identify minerals?
      • From their properties:
      • Color
      • Streak
      • Luster
      • Cleavage or Fracture
      • Hardness
    • Color
      • Many minerals come in different colors, or can even change color.
      • Different colors of quartz
    • Streak
      • When a mineral is rubbed against something hard, a powder is left.
      • A minerals streak will always have the same color.
    • Streak
    • Luster
      • Minerals can reflect light.
      • They way light reflects is called luster.
      • Many shine like metal, metallic luster
      • Some minerals have a nonmetallic luster.
    • Cleavage
      • Minerals break in different ways.
      • A mineral that splits along a smooth, flat surface has cleavage.
      Cubic (halite) Flat Sheets ( mica )
    • Fracture
      • Some minerals do not break along a flat surface.
      • Fractured minerals look like rough clumps or curved pieces.
      Curved (olivine) (quartz)
    • Hardness
      • Minerals have different hardness's.
      • Minerals are measured from 1 to 10 on Mohs’ hardness scale.