Obsidian | Volcano World | Oregon State University
Obsidian is natural glass that was originally molten magma associated with a volcano. This volcanic glass has an almost total absence of sizable mineral crystals within the glass matrix. …
Obsidian & Volcano Bubbler | Clear Percolator | Magma Industries
Magma and Obsidian bubblers allow you to enjoy every last bit of your herbs or essential oils by cooling and humidifying your otherwise hot and dry vapor before it enters your Volcano …
Long Valley Caldera Field Guide - Obsidian Dome
2023年11月11日 · Obsidian Dome viewed from Glass Creek Dome, Long Valley Caldera. (Public domain.) Obsidian, Glass Creek, and Deadman Creek domes all erupted in 1350 CE (Millar, et …
Big Obsidian Flow | U.S. Geological Survey - USGS.gov
2023年11月3日 · The Big Obsidian Flow is the youngest volcanic feature at Newberry and covers just over 2.6 square kilometers.
Big Obsidian Flow is one of Oregon's greatest volcanic attractions
2017年10月22日 · The massive flow of glassy black obsidian and gray pumice is one of Oregon's best volcanic attractions, both for the sheer awe it produces and its geological significance in …
Glass Mountain obsidian flow, Medicine Lake volcano
2023年10月28日 · Glass Mountain is a spectacular, nearly treeless, steep-sided rhyolite and dacite obsidian flow that erupted just outside the eastern caldera rim and flowed down the …
Obsidian | Rock, Color, Composition, & Uses | Britannica
Obsidian is an igneous rock occurring as a natural glass that is formed by the rapid cooling of viscous lava from volcanoes. Where is obsidian found? Some of the best-known occurrences …
Obsidian: Igneous Rock - Pictures, Uses, Properties - Geology.com
Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known …
Obsidian | AMNH - American Museum of Natural History
Obsidian is an "extrusive” rock, which means it is made from magma that erupted out of a volcano. If it was an igneous rock that formed from magma underground and did not erupt, it …
What is obsidian? Why obsidian is black? - Geology Page
2019年8月17日 · Obsidian is created when the volcano’s felsic lava cools quickly with minimal crystal growth. The chemicals (hodium silica content) produce a elevated viscosity that shapes …
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