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Tridymite
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Details
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tridymite is a high-temperature polymorph of quartz and usually occurs as minute tabular white or colorless pseudo-hexagonal triclinic crystals, or scales, in cavities in acidic volcanic rocks. Its chemical formula is SiO2. Tridymite was first described in 1868 and the type location is in Hidalgo, Mexico. The name is from the Greek Tridymos for triplet as tridymite commonly occurs as twinned crystal trillings.[3] Tridymite can occur in several crystalline forms, which are metastable at ambient conditions, the most common being and . Alpha phase is orthorhombic, Pearson symbol oS24, group C2221, No.20 whereas -tridymite is hexagonal, hP12, P63/mmc, No. 194. -tridymite converts to -cristobalite at 1470 °C.
Weitere Informationen
- Allgemeine Informationen
- GTIN 09786131033858
- Editor Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
- Genre Geowissenschaften
- Anzahl Seiten 124
- Größe H220mm x B220mm
- EAN 9786131033858
- Format Fachbuch
- Titel Tridymite
- Herausgeber Betascript Publishing
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