volcanic glass

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volcanic glass

Any 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.

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No references found			Saal's analysis involved polishing tiny grains of volcanic glass in the rocks to get to the chemical composition inside. Water on the moon: lunar secret revealed by guardian.co.uk / guardian.co.uk The soil also contained round, black glassy specks that could be volcanic glass, said mission scientist Tom Pike of Imperial College in London. AROUND L.A by Daily News (Los Angeles, CA) At right, a glass beaker holds orange microbial material slurped up by Camper's vacuum sampler, as well as tiny black shards of volcanic glass that covered large areas of the Gakkel Ridge seafloor. Intriguing discoveries by Oceanus			volar volatile volatile component volatile file volatile fluid volatile flux volatile laurel oil volatile memory volatile organic compounds volatile storage volatile thinner volatile variable volatile-oil reservoir Volatility volatility product volatilization volborthite volcanello volcanic arc Volcanic Ash Volcanic Bomb volcanic bombs volcanic breccia volcanic foam Volcanic Gases volcanic glass Volcanic Legacy Scenic Byway - California Volcanic Legacy Scenic Byway - Oregon volcanic mud volcanic mudflow Volcanic Neck volcanic rift zone Volcanic Rock volcanic theory Volcanic Tuff volcanic vent volcanicity volcaniclastic rock volcanics volcanism volcano Volcano Islands Volcanoes Volcanogenic Sedimentary Deposits Volcanogenic Sedimentary Rock Volcanology Volcanology, Institute of Volchansk Volchek, Boris Volchek, Boris Izrailevich Volcher Coiter			Volcanic bomb Volcanic bomb Volcanic bombs Volcanic bombs Volcanic bombs Volcanic bombs Volcanic bombs Volcanic breccia Volcanic breccia Volcanic breccia Volcanic caldera Volcanic caldera Volcanic caldera Volcanic cone Volcanic cone Volcanic cones volcanic crater Volcanic Destruction Level Volcanic dome volcanic eruption volcanic eruption volcanic eruption volcanic eruption volcanic eruption Volcanic Eruptions Volcanic Explosivity Index volcanic foam Volcanic foci Volcanic gas Volcanic gases volcanic glass Volcanic Hazard-Zone Volcanic island Volcanic island Volcanic island Volcanic island Volcanic island Volcanic island Volcanic island Volcanic Islands Volcanic Islands Volcanic Islands Volcanic Islands Volcanic Islands Volcanic Islands Volcanic isles Volcanic isles Volcanic isles Volcanic isles Volcanic isles Volcanic isles Volcanic lake Volcanic lake Volcanic lake Volcanic Legacy Scenic Byway Volcanic Legacy Scenic Byway - California Volcanic Legacy Scenic Byway - Oregon Volcanic mountain Volcanic mountain Volcanic mountain Volcanic mountain

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