Basic Properties Of Minerals

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Based on McDougal Littell Earth Science series

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Basic Properties Of Minerals

  1. 1. Properties of Minerals Earth’s Surface 2.2 (pg. 51-57) Ms. Wells, Science
  2. 2. Properties of Minerals: Why do we care? <ul><li>Property – characteristic, quality or trait of something </li></ul><ul><li>Used to IDENTIFY a mineral </li></ul><ul><li>Is it salt? Is it quartz? Is it talc? Who knows! TEST the properties to find out! </li></ul>
  3. 3. Properties of Minerals: Which are the most important? <ul><li>Streak </li></ul><ul><li>Luster </li></ul><ul><li>Cleavage or Fracture </li></ul><ul><li>Density </li></ul><ul><li>Hardness </li></ul>
  4. 4. Appearance Property: Streak <ul><li>Streak – color of the powder a mineral leaves behind when you scrape it across something </li></ul><ul><li>Shows true color better than looking at a whole mineral </li></ul><ul><li>Use “streak plate” made of porcelain </li></ul>
  5. 5. Appearance Properties: Luster <ul><li>Luster – the way a mineral reflects light </li></ul><ul><ul><li>(QUALITATIVE OBSERVATION  ) </li></ul></ul><ul><li>Luster Terms: </li></ul><ul><ul><li>Metallic – shiny like a metal </li></ul></ul><ul><ul><li>Non metallic – not shiny like metal </li></ul></ul><ul><ul><ul><li>Oily – feels or looks greasy </li></ul></ul></ul><ul><ul><ul><li>Glassy – shiny like glass </li></ul></ul></ul><ul><ul><ul><li>Dull – plain, earthy </li></ul></ul></ul>
  6. 6. Metallic Luster
  7. 7. Nonmetallic Luster
  8. 8. Breaking Properties: Cleavage or Fracture <ul><li>Cleavage – mineral breaks along a flat surface or into sheets </li></ul><ul><li>Fracture – when a mineral breaks with lots of jagged edges </li></ul>
  9. 9. Property: Density <ul><li>Density – mass divided by volume of a mineral (in other words: how heavy it is for how much space it takes up) </li></ul><ul><li>GOLD is denser than PYRITE (“Fool’s Gold”) </li></ul><ul><ul><li>Feels heavier </li></ul></ul>
  10. 10. Fracture or Cleavage? <ul><li>Determined by the crystal structure of the mineral </li></ul><ul><ul><li>Crystal structure – how atoms of the mineral are arranged (special order of the atoms) </li></ul></ul><ul><ul><li>ALL minerals have crystal structure, but there are different kinds </li></ul></ul>
  11. 12. Property: Hardness <ul><li>Hardness – a mineral’s resistance to being scratched </li></ul><ul><li>test what can scratch it and what it can scratch </li></ul><ul><li>Use “Moh’s Scale” to assign hardness </li></ul><ul><ul><li>Scale of 1 to 10 </li></ul></ul><ul><ul><ul><li>10 = hardest = diamond! </li></ul></ul></ul><ul><ul><ul><li>1 = softest = talc! </li></ul></ul></ul>
  12. 14. Extra Special Properties <ul><li>1. Fluorescence </li></ul><ul><ul><li>Fluorescent color under ultraviolet (UV) light </li></ul></ul><ul><li>2. Magnetic </li></ul><ul><ul><li>Attract magnets </li></ul></ul><ul><li>3. Acid reaction </li></ul><ul><ul><li>Carbon dioxide gas bubbles off when you drop acid on them </li></ul></ul><ul><ul><li>Carbonates! </li></ul></ul>
  13. 15. Fluorescence
  14. 16. Magnetic
  15. 17. Carbonate Acid Reaction
  16. 18. The End! YAY!

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