On the Mohs scale, this mineral can be scratched by every other mineral
... Other hardness scales rely on the ability to create an indentation into 
the ... For instance quartz will be able to scratch calcite with much greater ease... [DOC] [TLE] Mohs scale of mineral hardness, minerals identification [PAR] He created a hardness scale that is still used as Mohs scale of mineral ... You can 
use minerals of known hardness to determine the relative hardness of any other 
mineral.