Hi I’m Geologist John Swanson and today I’m going to talk about the hardness scale for minerals.In 1812, German mineralogist Frederich Mohs penned what would become what is referred to as Mohs’ Scale of Mineral Hardness. For his scale, he selected 10 minerals based upon their being common and readily available. It should be noted that the scale is not actually linear but rather arbitrary. Here is the Mohs Scale of hardness including the hardness number, the mineral associated and its common uses.Associations and uses: talcum powderAssociations and uses: Plaster of paris. Gypsum is formed when seawater evaporates from the Earth’s surface.Associations and uses: Limestone and most shells contain calcite.Associations and uses: Fluorine in fluorite prevents tooth decay.Associations and uses: used to manufacture fertilizerAssociations and uses: Orthoclase is a feldsparAssociations and uses: is a lovely crystal and is often used in jewelryAssociations and uses: The November birthstone.Associations and uses: Sapphire and ruby are varieties of corundum.Associations and uses: Used in jewelry and cutting tools.Hopefully now you understand the Mohs Scale of Hardness. Thanks for watching. If you’d like to learn more, please find us on the web at About.com.
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