These plates help you determine the hardness of unknown minerals in the field.
- Plates Determine How Hard Minerals Are
- System Uses Mohs' Scale
- Ideal for Unknown Minerals in the Field
- Custom-Swiped Edges Reduce Risk of Injury
Scratch your mineral across the plate determine how hard it is. If the mineral scratches the plates, it’s harder than five on the Mohs’ hardness scale.
The custom-swiped edges reduce risk of accidental injury when handling.