tridymite


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Related to tridymite: cristobalite

tridymite

(ˈtrɪdɪˌmaɪt)
n
(Minerals) a form of silica found in igneous rock
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun1.tridymite - a mineral form of silicatridymite - a mineral form of silica    
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
silica, silicon dioxide, silicon oxide - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Global Silicon Dioxide Market: Information by Form (Amorphous, Quartz, Keatite, Cristobalite, Coesite, Tridymite), Purity (2N (99%), 2N5 (99.5%), 3N (99.9%), 3N5 (99.95%), 4N (99.99%), 5N (99.999%) and Less Than 99% Purity), Application (Building Materials, Glass & Ceramics, Paints & Coatings, Adhesives & Sealants, Food & Pharmaceutical Additives, Silicon Wafers), End-Use Industry (Building & Construction, Electricals & Electronics, Healthcare, Food & Beverages, Chemical) and Region - Forecast till 2023
Other modifications of crystalline silica, such as cristobalite and tridymite, are considerably more rare.
"One of the main things we saw first were the large silica crystals of tridymite which is a similar to the mineral quartz," Srinivasan said in a (http://news.unm.edu/news/researchers-at-the-university-of-new-mexico-uncover-remnants-of-early-solar-system) statement .
The transformation of the phases occurs as the temperature increases, and the silica is transformed into its different polymorphic forms, such as low quartz (573[degrees]C), high quartz (867[degrees]C), tridymite (>1400[degrees]C), and cristobalite (>1450[degrees]C).
The broad diffraction peak around 21.5[degrees] suggests the nanofibers are in amorphous phase of silica, which can be indexed to the (100) lattice plane of the tridymite (JCPDS number 75-0638) (Figure 4(a)) [26].
At Buckskin, the rover discovered an unusual silica mineral called tridymite. On Earth, tridymite is only found in environments with low pressures but extremely high temperatures--typically, explosive, silica-rich volcanic eruptions.
At temperatures greater than 800[degrees]C, the amorphous silica present in sugarcane is converted in crystalline silica polymorphs, such as quartz, cristobalite, and tridymite [18].
At another site, Curiosity found tridymite, a silicon dioxide that forms above 870[degrees] Celsius, where flows of silica-rich lava cool, says Richard Morris, a geochemist at NASA's Johnson Space Center in Houston.