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According to Mohs Hardness Scale, which statement below is TRUE: click hardness scale in the the picture to the right.

Image reference
A.
Talc can scratch Gypsum

B.
Corundum can scratch Diamond

C.
Topaz can scratch Quartz

D.
You can scratch Apatite with your fingernail

1 answer

The true statement according to Mohs Hardness Scale is:

D. You can scratch Apatite with your fingernail.

In Mohs Hardness Scale, Apatite has a hardness of 5, and fingernails have a hardness of about 2.5, meaning you can indeed scratch Apatite with a fingernail.

The other statements are incorrect:

  • A. Talc cannot scratch Gypsum (Talc has a hardness of 1 and Gypsum has a hardness of 2).
  • B. Corundum cannot scratch Diamond (Corundum has a hardness of 9, and Diamond has a hardness of 10).
  • C. Topaz (hardness of 8) cannot scratch Quartz (hardness of 7).