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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 ...
Obsidian can be used to make extremely sharp knives, and obsidian blades are a type of glass knife made using naturally occurring obsidian instead of manufactured glass. Obsidian is used by some surgeons for scalpel blades, although this is not approved by the US Food and Drug Administration (FDA) for use on humans. [61]
Most commonly, volcanic glass refers to obsidian, a rhyolitic glass with high silica (SiO 2) content. [7] Other types of volcanic glass include the following: Pumice, which is considered a glass because it has no crystal structure. Apache tears, a kind of nodular obsidian.
Obsidian projectile point.. Obsidian is a naturally formed volcanic glass that was an important part of the material culture of Pre-Columbian Mesoamerica.Obsidian was a highly integrated part of daily and ritual life, and its widespread and varied use may be a significant contributor to Mesoamerica's lack of metallurgy.
The cylinder seals themselves are typically made from hardstones, and some are a form of engraved gem.They may also use glass or ceramics, like Egyptian faience.Many varieties of material such as hematite, obsidian, steatite, amethyst, lapis lazuli and carnelian were used to make cylinder seals.
For example, obsidian tools found along the Gulf coast at sites such as Dosariyah (Saudi Arabia) and Wadi Debayan came from sources in southeastern Turkey. [ 29 ] The Ubaid may have witnessed a shift in the production of flint tools from being carried out as a domestic activity to a more specialized activity carried out by dedicated craftspeople .
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In the few técpame that have survived, there are some representations of deities in their handles. A famous pre-Columbian example is the carved image of a figure using circular plugs in its ears and a big bow ornament made out of feathers, which associates this figure with Tonatiuh, the sun god. Tonatiuh's arms appears to be holding the knife ...