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The crystal structure of “Tetragonal Almandine-Pyrope Phase” (TAPP): A reexamination
-
Larry W. Finger
und
Pamela G. Conrad
Veröffentlicht/Copyright:
25. März 2015
Abstract
X-ray intensities for the “tetragonal almandine-pyrope phase” (TAPP), *(FeMg)VIII(AlMgFe)4[IV(SiAl)O4]3 where * refers to a capped tetrahedral site, reported by Harris et al. (1997) were recollected using the identical crystal, and the crystal structure was refined from these new data. The basic structure of the previous report is confirmed; however, some of the details regarding cation occupancies are revised. The chemical composition of this phase corresponds to a high-pressure origin; however, significant questions remain regarding the crystallization pressure of this phase
Received: 1999-7-30
Accepted: 2000-7-7
Published Online: 2015-3-25
Published in Print: 2000-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Patterns of mineral occurrence in metamorphic rocks
- A double magmatic heat pump at the core-mantle boundary
- High-temperature contact metamorphism of calc-silicate xenoliths in the Kiglapait Intrusion, Labrador
- Multiple pyroxene and amphibole assemblages in the amphibolite facies: Bulk compositional controls
- Margarite-corundum phyllites from the Appalachian orogen of South Carolina: Mineralogy and metamorphic history
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- Monazite geochronology of UHP and HP metamorphism, deformation, and exhumation, Nordøyane, Western Gneiss Region, Norway
- Solubilities of noble metals in Fe-containing silicate melts as derived from experiments in Fe-free systems
- Water speciation in silicate glasses and melts: Langmuir limited site model
- The ab initio study of the stability of low temperature Al/Si ordered albite, NaAlSi3O8
- The heat capacity of MgCr2O4, FeCr2O4, and Cr2O3 at low temperatures and derived thermodynamic properties
- Thermodynamics of the R3̅ to R3̅c phase transition in the ilmenite-hematite solid solution
- An ab initio study of hydrogarnets
- Short-range order in synthetic aluminous tremolites: An infrared and triple-quantum MAS NMR study
- In-situ Raman spectroscopy of quartz: A pressure sensor for hydrothermal diamond-anvil cell experiments at elevated temperatures
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- In situ measurement of viscosity of liquids in the Fe-FeS system at high pressures and temperatures
