|Product Catalog > Rock & Mineral Identification Accessories > Glass Plate|
Glass plates are great for testing minerals. Glass plates are a key item on the Mohs Hardness Scale and will help you determine the identity of your mineral samples. To perform the hardness test, place the glass plate on a solid surface then rub the mineral on the plate. If the mineral scratches the plate, the mineral’s hardness is greater than 5.5 on the Mohs scale. If the mineral does not scratch the plate, the mineral’s hardness is equal to or less than 5.5. Each glass plate is 2” x 2”.