Granite is much harder than marble. The hardness of stone is measured on a scale of 1 to 10. Ten is the hardest mineral. Diamond is a ten. Most marbles fall in the 3-5 range and granites fall into the 7-8 range.
A simple test to determine if you are dealing with marble or granite is to try to scratch the surface of the stone with a knife blade. A knife blade has a hardness of about 6. If the surface scratches you are dealing with a marble or limestone. If its difficult to scratch you may be dealing with a granite.
Article ID: 432
Created: January 20, 2022
Last Updated: January 20, 2022
Author: Pam Freitag
Online URL: https://sr-manual.com/kb/article/which-is-harder-marble-or-granite-432.html