Each sample will come supplied in a card tray with an information label. Since obsidian will fracture down to a single atom, it is claimed to have a cutting edge five hundred times sharper than the sharpest steel blade, and under a high magnification microscope an obsidian blade still appears smooth, whereas a steel blade has a saw like edge. These particular samples come from South East Mexico, the pieces will display typical black colouration and conchoidal fractures, making them suitable for both collectors, enthusiasts and educational use. One study found that obsidian incisions produced narrower scars, fewer inflammatory cells, and less granulation tissue in a group of rats. An open edge describes a surgical blade ground on both sides, but only finished on one. The better the tactile feel, the more control the surgeon has, resulting in more consistent and more precise incisions. A sharper cut will allow a wound to heal more rapidly with less scarring. A scalpel blade’s edge is its actual sharp cutting surface, which serves as an important component of the surgeon’s tactile feel. It has been used experimentally as scalpel blades in the past and recent years. On the cellular level an obsidian knife can cut between cells rather than tear the cells as a steel knife will do. It is this particular feature which has made obsidian an important rock in human history and evolution and why it is so well known and popular, as the sharp edges allowed it to be used in the past in cutting and piercing tools, most notably, arrow and spear heads. the edge of a piece of obsidian is superior to that of a surgeons steel scalpel. It is hard and brittle rock with a black appearance due to the presence of conchoidal fractures, it therefore breaks with very sharp edges. Because of its sharp edges early man used it to make cutting tools or. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows, its high silica content (70 -75%) produces a highly viscous lava with some degree of polymerization. Obsidian is a natural volcanic glass, an extrusive igneous rock, it is produced when silica rich lava extruded from a volcano rapidly cools minimising crystal growth which gives the rock a fine, glassy texture. Yorkshire Geological Society Field Guides.
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