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so showing it to be harder. This became the basis of the hardness scale developed by Mohs. The hardest mineral, diamond, was given a value of 10 and softer minerals such as talc were given the value of 1. Other minerals were given values intermediate, depending on their ability to scratch another mineral in the scale. Thus gypsum was given the value 2 because it will scratch talc crystals, and calcite the value

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