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volcanic glass |
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volcanic glassAny glassy rock formed from lava or magma that has a chemical composition close to that of granite. Such molten material may reach very low temperatures without crystallizing, but its viscosity may become very high. Because high viscosity inhibits crystallization, the combination of sudden cooling and loss of volatiles, as when lava extrudes from a volcanic vent, tends to chill the material to a glass rather than crystallize it. volcanic glass [väl′kan·ik ′glas] (geology) Natural glass formed by the cooling of molten lava, or one of its liquid fractions, too rapidly to allow crystallization. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Indeed, Manga and his colleagues found evidence of the repeated fragmentation and consolidation of magma when they examined samples of banded obsidian, a type of volcanic glass, formed during an ancient eruption of Big Glass Mountain. Ranger Kupono McDaniel said he once was five miles from the flow when a large piece of volcanic glass struck him in the eye. |
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