Which mineral stands at 10, the top of the hardness scale?
- Topaz gem
- Quartz
- Diamond
- Corundum
Show answer and solution
Correct answer: C. Diamond
1. Corundum is 9 and topaz 8.
2. Diamond is 10.
3. Quartz is 7.
_Source: syllabus Fundamentals of Physical Geography, Chapter 5, Minerals and Rocks._