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Mineral Identification Methods: Streak, Hardness, Density

Learn how to identify minerals using streak, hardness, and density. Discover the differences between fracture and cleavage in mineral breakage. Explore practical lab tests for hardness.

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Mineral Identification Methods: Streak, Hardness, Density

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  1. Bell work 9/18/2017 GET YOUR COMP BOOK! Mineral Breakage Observe the picture below then decide if it shows fracture or cleavage. Cleavage

  2. Let’s Review… Fracture or Cleavage?

  3. Let’s Review… YES Does it have luster?

  4. Identifying Minerals Density Streak Hardness

  5. Today’s Goals… • Describe streak. • Recognize the hardness of a mineral. • Explain how streak and hardness can be used to identify an unknown mineral.

  6. DENSITY… • Density is how closely packed together atoms are in a given volume of space. • Density is the amount of matter you have to fill in a specific space. • When there is more matter in a given space, it is more dense. Density = mass/volume

  7. Observe the DENSITY column below: Rubbing Alcohol Vegetable Oil Toy Block Water Maple Syrup Marble

  8. What is streak? On your foldable… Streak is the color of the powder of a mineral.

  9. What is hardness? On your foldable… Hardness is a measure of the ability of a mineral to resist scratching.

  10. Hardness Test Lab: • Try to scratch all four minerals with your fingernail. • Try to scratch a penny using all four minerals. • Try to scratch all four minerals with a nail.

  11. Which picture below shows streak? B A C D

  12. Which is harder: Calcite or Topaz?

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