Obsidian white dating
The excavation of Granite Point was contracted to Washington State University and fieldwork was conducted during the summers of 19 by Washington State University faculty and field school students. The completion of dams along the Snake River flooded Granite Point Locality 1, and though the physical locality is inaccessible, the river’s waters do not prohibit its continued study.
The 1967 field season was led by Roderick Sprague, while Ph. Through the study of Granite Point’s archaeological collection, this archaeologically important site has the potential to further its contributions to understandings of prehistoric life in the Lower Snake River Region.
Although excellent quality obsidian specimens can sometimes be produced by surface lava flows, the best quality of Obsidian forms around volcanic vents just below the ground.
As the lava squeezes in between rocks it forms layers of Obsidian that are relatively clear of impurities.
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.
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.
The ancient volcanic hills called Glass Buttes in Oregano hold a large variety of gem-quality obsidian, including: mahogany, red, flame, midnight lace, jet black, pumpkin, brown, rainbow, gold sheen, silver sheen, green, lizard skin, snowflake etc, so if you ever thought that Obsidian is just boring black glass, the trip to those parts might be an eye-opener.
In the ancient times, people frequently used obsidian for making weapons because it could be fractured to produce sharp blades or arrowheads. Pre-Columbian Mesoamericans used obsidian for tools and decorative objects.
A polished Obsidian blade is much sharper than the blade of a surgical scalpel and is now often used in cardiac surgery.
Inclusions of small, white, radially clustered crystals of cristobalite in the black glass produce a blotchy or snowflake pattern.
This type of obsidian is commonly referred to as snowflake obsidian. Obsidian only occurs around volcanoes which have had rhyolitic eruptions.
The process can be sped up in the presence of water.