Science project

The Scratch Test: Testing a Rock's Hardness

Third Grade Science Science projects: The Scratch Test: Testing a Rock's Hardness


  • Rock salt
  • Quartz
  • Nail
  • Other easily accessible minerals


  1. Observe the two minerals closely. Write down your observations of how they feel and look. You may even want to draw an illustration of the two minerals.
  2. Using the pointed end of the nail, carefully try to scratch the surface of the quartz. Record what happened. Did the nail scratch the quartz?
  3. Now try to scratch the rock salt with the nail. Record what happened. Did the nail scratch the rock salt?
  4. If you have other minerals, repeat this test on each of the minerals. Record all of your observations in chart.
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