Lonsdaleite static press or using explosives. It has also been produced by chemical vapor deposition, and also by the thermal decomposition of a polymer, poly(hydridocarbyne), at atmospheric pressure, under argon atmosphere, at . It is translucent, brownish-yellow, and has an index of refraction of 2.40 to 2.41 and a specific gravity of 3.2 to 3.3. Its hardness is theoretically superior to that of cubic diamond (up to 58% more), according to computational simulations, but natural specimens exhibited somewhat lower hardness through a large range of values (from 7 to 8 on Mohs hardness scale). The cause is speculated as being due
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.