Pyrite's hardness is 6-6.5. identifying minerals due to the fact that a mineral's streak never changes. Pyrite's streak is greenish black. Scratch: The scratch test is also another common way to identify minerals
fact when it is rubbed on a streak plate the streak will be green to dark gray. Pyrite has a hardness of 6.5 on the Mohs hardness scale. Its cleavage is cubic or not distinct.
