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Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools, and it has been used experimentally as surgical scalpel blades. [8]
The newest powder metallurgy steels can be made very hard, but can quickly wear out abrasives and tooling. A blade made from low carbon or mild steel would be inexpensive to produce and of poor quality. A low carbon blade would be very hard to break, but would bend easily and be too soft to hold an edge.
Obsidian hydration dating (OHD) is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian.. Obsidian is a volcanic glass that was used by prehistoric people as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through knapping, or breaking off pieces in a controlled manner, such as ...
Knapping is the shaping of flint, chert, obsidian, or other conchoidal fracturing stone through the process of lithic reduction to manufacture stone tools, strikers for flintlock firearms, or to produce flat-faced stones for building or facing walls, and flushwork decoration.
Audrii, a fifth-grade student, was reported missing after she did not show up to school on Feb. 15.. Dr. Brent Hawkins, superintendent of the Livingston Independent School District in Texas, told ...
Obsidian. Conchoidal fracture breakage that resembles the concentric ripples of a mussel shell. It often occurs in amorphous or fine-grained mineraloids such as flint, opal or obsidian, but may also occur in crystalline minerals such as quartz. Subconchoidal fracture is similar to conchoidal fracture, but with less significant curvature.
It seems hard to believe that not so long ago something affecting more than 50 percent of the population was barely even talked about. But thanks to Oprah, Dr. Mary Claire Haver and many others ...
Prosecutors alleged in the neglect charge filed in court this week that Bowen knew about her child’s injuries for several days before deciding to take the infant to a local hospital for help ...