Mineralogy classified into density (often given as specific gravity); measures of mechanical cohesion (hardness, tenacity, cleavage, fracture, parting); macroscopic visual properties (luster, color, streak, luminescence, diaphaneity); magnetic and electric properties; radioactivity and solubility in hydrogen chloride (). "Hardness" is determined by comparison with other minerals. In the Mohs scale, a standard set of minerals are numbered in order of increasing hardness from 1 (talc) to 10 (diamond). A harder mineral will scratch a softer, so an unknown mineral can be placed in this scale by which minerals it scratches and which scratch it. A few minerals such as calcite and kyanite
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.