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However, obsidian hydration can only be used on surfaces which were exposed by flintknapping (the process of chipping and shaping flint to give it sharp edges useful for scraping and cutting) and it is not effective on surfaces that are uneven due to gradual weathering caused by natural forces.To use obsidian hydration for absolute dating it is important to know the conditions that the sample has been exposed to.Indeed, Obsidian is not a true mineral because it lacks crystal structure.Probably a better description, and that most often used for Obsidian, is a that it is a naturally occurring form of glass.While pure Obsidian is dark in appearance, the colour varies depending on the presence of impurities.For example, iron and magnesium gives obsidian a dark green to brown shade.45WT41 Slides008 " data-medium-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides008-396x260.jpg" data-large-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides008.jpg" / 45WT41 Slides110 " data-medium-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides110-396x260.jpg" data-large-file="https://s3wsu.edu/uploads/sites/1883/2018/05/45WT41-Slides110.jpg" / Granite Point Modern_small " data-medium-file="https://s3wsu.edu/uploads/sites/1883/2018/05/Granite Point Modern_small-396x257.jpg" data-large-file="https://s3wsu.edu/uploads/sites/1883/2018/05/Granite Point Modern_small-792x515.jpg" /Granite Point Locality 1 (45WT41) is a prehistoric site that was situated along the Lower Snake River.The planned damming of the Snake River threatened archaeological sites located along the river’s edge leading the Army Corps of Engineers to contract salvage excavations at Granite Point and several other endangered archaeological sites. These excavations uncovered the site’s long history of occupation and revealed a record of 10,000 years of cultural change which made Granite Point an important component to building a cultural chronology of the Lower Snake River Region.
This type of obsidian is commonly referred to as snowflake obsidian. Obsidian only occurs around volcanoes which have had rhyolitic eruptions.(Silicon dioxide also known as silica from latin silex meaning flint stone) in water.Chemically, Obsidian closely resembles granite and rhyolite but the processes which lead to the formation of Obsidian are different to those which shape granite.Rhyolitic means eruptions from volcanoes which have highly viscous, silica-rich lava.These can be found in many places around the world including Mexico, North America, Armenia, Turkey, Italy, Greece and Scotland.