volcanic glass


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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.
References in periodicals archive ?
This composition is consistent with a silica-rich volcanic glass containing plagioclase and phyllosilicate inclusions, together with secondary calcite veins.
De Baar (1998), "Biologically Mediated Dissolution of Volcanic Glass in Sea Water," Earth Planet Sci Lett 164: 233-244.
The ash was composed of a complex mixture of aluminosilicate volcanic glass and minerals including iron, titanium, manganese, zinc, strontium, and barium.
Excavations recovered 24 volcanic glass artefacts in Component 1; however, only one of these artefacts was found in association with the umus.
The FJPZ50 sample was classified as a volcanic tuff, a pyroclastic geomaterial formed as fragmental products of volcanic eruptions, having feldspar phenocrystals, in a white, vesicular, volcanic glass matrix.
The Big Island is the next big place boasting everything from active volcanoes to exotic beaches, where the sand is green because of volcanic glass.
The soil also contained round, black glassy specks that could be volcanic glass, said mission scientist Tom Pike of Imperial College in London.
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.
Perlite is an insulation board composed of inorganic expanded silicaceous volcanic glass (perlite) combined with organic fibers and binders.
Obsidian, or volcanic glass, is formed as a result of volcanic activity.
Volcanic glass was separated from the sample and analyzed by electron-microprobe for major elements.