How to use in-sentence of “mohs hardness”:
+ Stibnite is soft, with a Mohs hardness of 2.
+ Its Mohs hardness is 4.5 to 5 and its specific gravity is quite high, around 8 or 9.
+ It has a Mohs hardness of 6.
+ Copper is also very soft, it has a Mohs hardness of 2.5 to 3.
+ It has a Mohs hardness of 2.5 to 3.
+ It has a Mohs hardness of 3.5 to 4.
