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Obsidian (/ ə b ˈ s ɪ d i. ən, ɒ b-/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. [6] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [1] [2] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980. Workers from the Weyerhaeuser Timber Company were ...
Apache tears are rounded pebbles of obsidian or "obsidianites" composed of black or dark-colored natural volcanic glass, usually of rhyolitic composition and bearing conchoidal fracture. Also known by the lithologic term marekanite, this variety of obsidian occurs as subrounded to subangular bodies up to about 2 in (51 mm) in diameter, often ...
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.
Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the closely packed, highly ordered array of a crystal and the highly disordered array of liquid. [ 1] Volcanic glass may refer to the interstitial material, or matrix, in an aphanitic (fine ...
The Hoshikuso Pass obsidian mine site is located at an elevation of 500 to 1500 meters, with the obsidian distributed all over the slope in a 220-meter north-to-south by 300 meter east-to-west orientation.
Examples of Glass Buttes obsidian. The Glass Buttes area offers a number of recreational opportunities including rock collecting, hiking, camping, hunting, and nature study. [4] Of these activities, rock collecting is the most popular. The buttes have one of the largest and most diverse deposits of obsidian in the world.
Obsidian Mountain in the Yellowstone, by Henry Farney Illustration of Obsidian cliff (volcanic glass) 200 feet high. Aug 18, 1888. Obsidian Cliff, also known as 48YE433, was an important source of lithic materials for prehistoric peoples in Yellowstone National Park near Mammoth Hot Springs, Wyoming, United States.
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