cristobalite wikipedia - EAS
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See all on Wikipediahttps://en.wikipedia.org/wiki/CristobaliteCristobalite is a mineral polymorph of silica that is formed at very high temperatures. It has the same chemical formula as quartz, SiO2, but a distinct crystal structure. Both quartz and cristobalite are polymorphs with all the members of the quartz group, which also include coesite, tridymite and … See more
Metastability
Cristobalite is stable only above 1470 °C, but can crystallize and persist metastably at lower temperatures. The persistence of cristobalite outside its thermodynamic stability range … See moreCristobalite occurs as white octahedra or spherulites in acidic volcanic rocks and in converted diatomaceous deposits in the Monterey Formation of … See more
• American Geological Institute Dictionary of Geological Terms.
• Durham, D. L., "Monterey Formation: Diagenesis". in: Uranium in the Monterey Formation of California. US Geological Survey Bulletin 1581-A, 1987. See moreWikipedia text under CC-BY-SA license- https://fr.wikipedia.org/wiki/Cristobalite
La cristobalite est un minéral, composé de dioxyde de silicium de formule SiO2 avec des traces : Fe, Ca, Al, K, Na, Ti, Mn, Mg, P. La cristobalite est stable seulement au-dessus de 1 470 °C, mais elle peut cristalliser et persister dans un état métastable à des températures plus basses. La persistance de la cristobalite en dehors de sa stabilité thermodynamique est rendue possible par les barrière…
Wikipedia · Text under CC-BY-SA license- Masse formulaire: 60,0843 ± 0,0009 uma, O 53,26 %, Si 46,74 %
- Formule chimique: SiO₂
- Nom IUPAC: Dioxyde de silicium
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- https://it.wikipedia.org/wiki/CristobaliteSee more on it.wikipedia.orgIn granuli e sferette. I cristalli sono molto piccoli di qualche millimetro di diametro pseudocubici o pseudoottaedrici, tuttavia l'abito della cristobalite è variabile a seconda della temperatura a cui si forma, cubica se è ad alta temperatura, tetragonale se la temperatura è bassa, in quest'ultimo caso i campioni del mineral…
- Classe di simmetria: trapezoidale
- Formula chimica: SiO₂
- Classificazione Strunz: IV/D.01-30
- Sistema cristallino: tetragonale
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Cristobalite - Wikipedia, the free encyclopedia · Continuing …
acva2010.cs.drexel.edu/omeka/items/show/37147WebThe mineral cristobalite is a high-temperature polymorph of silica, meaning that it has the same chemical formula as quartz, SiO , but a distinct crystal structure. Both quartz and …
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Cristobalite - Wikipedia
https://static.hlt.bme.hu/.../wiki/Cristobalite.htmlWebThe mineral cristobalite is a high-temperature polymorph of silica, meaning that it has the same chemical formula as quartz, SiO 2, but a distinct crystal structure. Both quartz and …
- https://ja.wikipedia.org/wiki/クリストバライト
Web性質・特徴 [ 編集] クリストバル石は 1,470 ℃ 以上で安定だが、低い温度でも 準安定 となる。. クリストバル石は、ほとんどの二酸化ケイ素の多形体と同じく、 フレームワーク …
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