The Rockwell hardness tester to measure the hardness of metal measures resistance to penetration like the Brinell test, but in the Rockwell case, the depth of the impression is measured rather than the diametric area. With the Rockwell tester, the hardness is indicated directly on the scale attached to the machine.
(Redirected from Apache Nation) The Apache (/ÉËpÃ¦tÊiË/; French: [a.paÊ]) are culturally related Native American tribes from the Southwestern United States, and have traditionally lived in Eastern Arizona, Northern Mexico (Sonora and Chihuahua), New Mexico, West Texas, and Southern Colorado.
Geology Home Page physical geology historical geology planetary gems. Roger Weller, geology instructor. wellerr@cochise.edu. Apache Tears (obsidian) by Erica Mallett Physical Geology Fall 2011. Apache Tears: From the Legend to Your Pocket. Apache tears are a form of black obsidian found around Superior, AZ.Apache tears are more than just a piece of black obsidian they hold a deeper meaning. The legend is about the Coyote, Tonto and Pinal Indians who were all part of one Apache tribe.pache Tears are more than just black volcanic glass. They are a symbol of the sacrifice that the Apache men gave and the pain that their loved ones felt that cold winter day in 1870. Apache Tears are not just a stone but are used to help heal not only the body but the soul as well.