Definitions
from The Century Dictionary.
- noun A form of silica found in small octahedral crystals in cavities in the andesite of the Cerro San Cristobal, Mexico. It may be pseudomorphous.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
mineral ofvolcanic rocks that solidified at a high temperature. Cristobalite is chemically identical toquartz , with thechemical formula Si O 2, but has a differentcrystal structure. Crystals are always microscopic, and usually form small rounded masses.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a white mineral consisting of silica; found in volcanic rocks
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The crystals, called cristobalite and tridymite, are known to reside in comets, in volcanic lava flows on Earth, and in some meteorites that land on Earth.
PhysOrg.com - latest science and technology news stories 2008
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NASA's Spitzer Space Telescope detected quartz-like crystals called cristobalite in young planetary systems.
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This surprises astronomers, because these crystals, which are types of silica minerals called cristobalite and tridymite, require flash heating events, such as shock waves, to order to form.
Universe Today 2008
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The crystals, called cristobalite and tridymite, are known to reside in comets, in volcanic lava flows on Earth, and in some meteorites that land on Earth.
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People will generally be very concerned about the effects of ash, and questions usually arise about the content of the ash, particularly regarding the minerals quartz, cristobalite, or tridymite.
Volcanic Ash -- Effects on Health and Mitigation Strategies 2009
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Of the free silica, about 4 percent is in the form of cristobalite and about 2 percent exists as fee quartz.
Volcanic Ash -- Effects on Health and Mitigation Strategies 2009
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Volcanic ash may contain varying proportions of free crystalline silica (silicon dioxide, SiO2) in the form of quartz, cristobalite, or tridymite minerals.
Volcanic Ash -- Effects on Health and Mitigation Strategies 2009
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Volcanic ash may contain varying proportions of free crystalline silica (silicon dioxide, SiO2) in the form of quartz, cristobalite, or tridymite minerals.
Volcanic Ash -- Effects on Health and Mitigation Strategies 2009
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People will generally be very concerned about the effects of ash, and questions usually arise about the content of the ash, particularly regarding the minerals quartz, cristobalite, or tridymite.
Volcanic Ash -- Effects on Health and Mitigation Strategies 2009
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The exposures to cristobalite sometimes reached the
Volcanic Ash -- Effects on Health and Mitigation Strategies 2009
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