Mohs Scale of Hardness, Hardness Scale.pptx

The hardness of a mineral is determined by rubbing a mineral of unknown hardness against hardness against one of the known hardness minerals.

1. Hardness Minerals Remarks 1 Talk Scratched by a finger nail 2 Gypsum 3 Calcite Scratched by a knife 4 Fluorite 5 Apatite 6 Orthoclase Scarcely scratched by a knife 7 Quartz 8 Topaz Not scratched by a knife 9 Corundum 10 Diamond Table: Mohs Scale of Hardness