Talc (1), the softest mineral on the Mohs scale has a hardness greater than gypsum (2) in the direction that is perpendicular to the cleavage. Diamonds (10) also show a variation in hardness (the octahedral faces are harder than the cube faces).
The Ambulatory Surgery Unit (ASU) is a multifaceted unit. A preoperative (preop) nurse assesses outpatients prior to the day of surgery. This is done at the ASU preop clinic visit and again on the day of surgery. The ASU RN assures the patient meets health and nursing criteria prior to surgery.
Ambulatory strictly means the ability to walk but in the context of surgery, it refers to patients who are able to leave the hospital the same day as the surgery, without being admitted. Ambulatory surgery is referred to by other names, commonly called minimally invasive surgery, outpatient surgery or same day surgery.