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MOH’S HARDNESS SCALE

MOH’S HARDNESS SCALE. This is a mineral's resistance to scratching. It is a relative scale. Minerals with higher numbers will scratch minerals below them on the scale . 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite. 6. Orthoclase 7. Quartz 8. Topaz 9. Corundum

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MOH’S HARDNESS SCALE

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  1. MOH’S HARDNESS SCALE • This is a mineral's resistance to scratching. It is a relative scale. Minerals with higher numbers will scratch minerals below them on the scale. • 1. Talc • 2. Gypsum • 3. Calcite • 4. Fluorite • 5. Apatite • 6. Orthoclase • 7. Quartz • 8. Topaz • 9. Corundum • 10. Diamond

  2. SPECIFIC GRAVITY I • This is the ratio of the density of the mineral to the density of water. • Weight Air/(Weight Air-Weight in water) = specific gravity

  3. SPECIFIC GRAVITY II • increases with increasing atomic weight of the cation. For example in the orthorhombic carbonates: • Aragonite CaCO3 2.95 • Strontianite SrCO3 3.76 • Witherite BaCO3 4.29 • Cerrusite PbCO3 6.55

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