Lesson 3.2 Scratch, Dent & Surface Hardness Test

1. Can we scratch Talc with just our fingernails? YES or NO

2. Can a metal coin scratch calcite? YES or NO

3. Can a feldspar scratch a glass? YES or NO

4. Can a corundum scratch a topaz? YES or NO

5. Can a corundum scratch a diamond? YES or NO

6. Dent Test: When we dropped the rock to the wooden pencils, was there a dent mark created? YES or NO

7. Dent Test: When we dropped the rock to the iron metal, was there a dent mark created? YES or NO

8. Dent Test: When we dropped the rock to the metal tin can, was there a dent mark created? YES or NO

9. SURFACE HARDNESS TEST: Which surface was the hardest?

• a. wooden floor

• b. concrete road

• c. rubberised pathway

10. SURFACE HARDNESS TEST: Which surface was the softest?

• a. wooden floor

• b. concrete road

• c. rubberised pathway