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The scale of hardness of minerals on which talc registers 1 and diamond registers 10 is called the "Mohs scale of mineral hardness." The Mohs scale is a relative scale that measures the hardness of minerals based on their ability to scratch one another. It was developed by Friedrich Mohs in 1812 and is widely used in geology to compare the hardness of different minerals. The scale ranges from 1 to 10, with talc being the softest mineral and diamond being the hardest, making diamond the reference point for the highest level of hardness.