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
Mohs surgery 2004 and 2014. In a sample of 100 Mohs surgeries, the cost ranged from US$474 to USUS$7,594, with the higher costs for hospital-based physicians. In 2010, hospital-based dermatologists who did Mohs surgery were paid US$586,083, according to Becker's Hospital Review. When the surgery is performed in different steps by different specialists, each specialist can bill for his or her own procedure, such as the surgery itself, closing the wound, anesthesiology, and facilities fees. This can total more than US$25,000 for a single procedure. Originally, Mohs used a chemical paste (an escharotic agent) to cauterize and kill the tissue. It was