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 The ACMS is open to physicians who have successfully completed advanced fellowship training in Mohs micrographic surgery, pathology, and reconstructive surgery. The ACMS currently has more than 1,300 member physicians. In 1995, an ancillary group called The American Society for Mohs Histotechnology was founded. The organization is composed of more than 375 non-physician laboratory technicians who process the slides evaluated during a Mohs procedure. The purpose of the ACMS is to "promote and advance high standards of patient care" with respect to Mohs surgery and other forms of cutaneous oncology through fellowship training, research, education, and public advocacy. The American