Glass Scratch Plate
Scratch Plates are used to help identify the hardness of a rock or mineral specimen. This is a thick tile to protect against breaking. It also has safety ground edges to prevent injury.Measures: 1" x 1"
Hardness testing with a glass plate: To perform a simple mineral test simply scratch your mineral across the glass plate.If the mineral scratches the plate, it is harder than 5.5 on Mohs hardness scale.
Warning: Item is made of glass and can cause cuts with handling and use.