Carl Friedrich Christian Mohs (German: [moːs]; 29 January 1773 – 29 September 1839) was a German geologist and mineralogist. He was the creator of the Mohs scale of mineral hardness. Mohs also introduced a classification of the crystal forms in crystal systems independently of Christian Samuel Weiss.

Mohs was born in Gernrode, in the Harz mountains Germany. He showed a clear interest in science at an early age and received private education before entering the University of Halle.

He started classifying minerals by their physical characteristics, instead of their chemical composition, as had been done traditionally. This emphasis on physical characteristics was at odds with the prevailing chemical systematics.

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