What is Mohs Hardness Scale? One of the most important tests for identifying mineral specimens is the Mohs Hardness Test. This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see table at left). The test is useful because most specimens of a given mineral are very close to the same hardness. This makes hardness a reliable diagnostic property for most minerals . Rocks & Minerals Test Kit with Mohs Hardness Scale Set contains 10 Minerals for Testing the Streak Test, Magnetism Test & Acid Reaction Test. This Collection contains 10 Minerals represents the scale of Hardness Talc (H=1), Gypsum (H=2), Calcite (H=3), Fluorite (H=4), Apatite (H=5), Orthoclase (H=6), Quartz (H=7), Topaz (H=8) & Corundum (H=9) & 10 Mineral Magnetite for Magnetism Test. In this Kit The Accessories & Tools is Knife, Iron Plate, Streak Plate, Glass Plate, Copper Plate, Iron Plate, Garnet Board, Magnet, Hand Lens, Acid Drop Bottle (Empty) & Instruction Manual for Doing These Test. These Rocks & Minerals Collections used for Practical Knowledge of Rocks Specimens & Minerals Specimens.