Friedrich Mohs 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 very low value of 1 (unity). Other minerals were given intermediate values, 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 3 because it will scratch gypsum. Minerals are also now classified by chemical characteristics, but the physical properties are still useful in field examination. In 1812, Mohs became a
American College of Mohs Surgery American College of Mohs Surgery The American College of Mohs Surgery (abbreviated as ACMS) is a membership-based organization of surgeons who are fellowship-trained in Mohs surgery, a technique that removes skin cancer in stages, one tissue layer at a time. Its president for 2015-16 is John G. Albertini. The ACMS is both the oldest and largest professional membership organization for Mohs surgeons. The American College of Mohs Surgery was established in 1967 by Frederic E. Mohs, a general surgeon based at the University of Wisconsin – Madison. In addition to founding the College, Mohs also served as its first president.