Mineral necessarily constant for all sides, which is a function of its structure; crystallographic weakness renders some directions softer than others. An example of this property exists in kyanite, which has a Mohs hardness of 5½ parallel to [001] but 7 parallel to [100]. The most common scale of measurement is the ordinal Mohs hardness scale. Defined by ten indicators, a mineral with a higher index scratches those below it. The scale ranges from talc, a phyllosilicate, to diamond, a carbon polymorph that is the hardest natural material. The scale is provided below: Lustre indicates how light reflects from the mineral's
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