German geologist best known for developing the Mohs Hardness Scale. Mohs presented his system for classifying minerals in Outline of Mineralogy, published in 1822. This same volume contained a description of his hardness scale, used to compare the hardness of various minerals as a way to help identify them. Still in use today, the Mohs scale ranges from hardness of 1 (talc) through 10 (diamond).
"Friedrich Mohs." Science and Its Times: Understanding the Social Significance of Scientific Discovery. . Encyclopedia.com. (January 21, 2019). https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/friedrich-mohs
"Friedrich Mohs." Science and Its Times: Understanding the Social Significance of Scientific Discovery. . Retrieved January 21, 2019 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/friedrich-mohs