Table 2.1 The Mohs Hardness Scale Mineral Assigned Hardness talc 1 gypsum 2 calcite fluorite apatite orthoclase quartz 7 topaz 8. corundum 9. diamond 10 For comparison, the approximate hardnesses of some common objects, measured on the same scale, are: fingernail, 22; copper penny, 3, glass, 5 to 6, pocketknife blade, 5 to 6. These materials can be used to estimate an unknown mineral's hardness when samples of these reference minerals are not available. According to this table,

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