Q. Arrange the following minerals according to their hardness in descending order:
1. Talc
2. Gypsum
3. Fluorite
4. Diamond
Select the correct answer using the codes given below:

[A] 1 2 3 4

[B] 1 3 2 4

[C] 4 3 2 1

[D] 4 2 3 1

Answer: C
Notes:

Hardness — relative resistance being scratched; ten minerals are selected to measure the degree of hardness from 1-10. They are: 

  1. talc; 
  2. gypsum; 
  3. calcite;
  4. fluorite; 
  5. apatite; 
  6. feldspar;
  7. quartz; 
  8. topaz; 
  9. corundum;
  10. Diamond.

Source: NCERT – XI Fundamentals of Physical Geography