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German geologist who gave his name to a hardness scale
German geologist who gave his name to a hardness scale, 4 letters, 1st letter M
German geologist who gave his name to a hardness scale, 4 letters, 2nd letter O
German geologist who gave his name to a hardness scale, 4 letters, 3rd letter H
German geologist who gave his name to a hardness scale, 4 letters, 4th letter S
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