Home Crystal structure of CaMg2Al6O12, a new Al-rich high pressure form
Article
Licensed
Unlicensed Requires Authentication

Crystal structure of CaMg2Al6O12, a new Al-rich high pressure form

  • Hiroyuki Miura EMAIL logo , Yoichi Hamada , Toshihiro Suzuki , Masaki Akaogi , Nobuyoshi Miyajima and Kiyoshi Fujino
Published/Copyright: March 25, 2015
Become an author with De Gruyter Brill
Author Information
American Mineralogist
From the journal American Mineralogist Volume 85 Issue 11-12

Abstract

The crystal structure of CaMg2Al6O12, a new high-pressure phase synthesized at 21.8 GPa and 1200 °C using a multi-anvil apparatus, was solved by a newly developed structure program and refined by Rietveld analysis of the powder X-ray diffraction profile. The structure is hexagonal with cell constants a = 8.7616(2) and c = 2.7850(1) Å, and space group P63/m. The structure of this phase contains double chains of edge shared AlO6 octahedra running along the c axis. Three double chains share corners to form sixfold positions in which octahedrally coordinated Mg atoms reside. The large Ca atoms are randomly distributed at ninefold sites with half-occupancy in the hexagonal tunnel. Previously reported Al-rich silicate phases could possibly have the same structure. This structure could thus qualify as one of the possible major host phases for aluminum in the lower mantle

Received: 2000-2-7
Accepted: 2000-8-4
Published Online: 2015-3-25
Published in Print: 2000-11-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Patterns of mineral occurrence in metamorphic rocks
  2. A double magmatic heat pump at the core-mantle boundary
  3. High-temperature contact metamorphism of calc-silicate xenoliths in the Kiglapait Intrusion, Labrador
  4. Multiple pyroxene and amphibole assemblages in the amphibolite facies: Bulk compositional controls
  5. Margarite-corundum phyllites from the Appalachian orogen of South Carolina: Mineralogy and metamorphic history
  6. Continuous metamorphic gradient documented by graphitization and K-Ar age, southeast Otago, New Zealand
  7. Kyanite eclogite thermobarometry and evidence for thrusting of UHP over HP metamorphic rocks, Nordøyane, Western Gneiss Region, Norway
  8. Monazite geochronology of UHP and HP metamorphism, deformation, and exhumation, Nordøyane, Western Gneiss Region, Norway
  9. Solubilities of noble metals in Fe-containing silicate melts as derived from experiments in Fe-free systems
  10. Water speciation in silicate glasses and melts: Langmuir limited site model
  11. The ab initio study of the stability of low temperature Al/Si ordered albite, NaAlSi3O8
  12. The heat capacity of MgCr2O4, FeCr2O4, and Cr2O3 at low temperatures and derived thermodynamic properties
  13. Thermodynamics of the R3̅ to R3̅c phase transition in the ilmenite-hematite solid solution
  14. An ab initio study of hydrogarnets
  15. Short-range order in synthetic aluminous tremolites: An infrared and triple-quantum MAS NMR study
  16. In-situ Raman spectroscopy of quartz: A pressure sensor for hydrothermal diamond-anvil cell experiments at elevated temperatures
  17. Modification of the hydroxyl surface of potassium acetate intercalated halloysite between 25 and 300 °C
  18. On the occurrence of anomalous fission tracks in apatite and titanite
  19. Reactivity of surface sites on fractured arsenopyrite (FeAsS) toward oxygen
  20. Surface area and porosity of primary silicate minerals
  21. Charge contrast imaging of geological materials in the environmental scanning electron microscope
  22. Chemical fine structure of Franciscan jadeitic pyroxene from Ward Creek, Cazadero area, California
  23. Crystal structure of CaMg2Al6O12, a new Al-rich high pressure form
  24. The crystal structure of “Tetragonal Almandine-Pyrope Phase” (TAPP): A reexamination
  25. The crystal structure of tetranatrolite from Mont Saint-Hilaire, Québec, and its chemical and structural relationship to paranatrolite and gonnardite
  26. Elyite, Pb4Cu(SO4)O2(OH)4·H2O: Crystal structure and new data
  27. Dukeite, Bi3+24Cr86+O57(OH)6(H2O)3, a new mineral from Brejaúba, Minas Gerais, Brazil: Description and crystal structure
  28. Pseudosinhalite is a structural isotype of chondrodite
  29. Structure type and bulk modulus of Fe3S, a new iron-sulfur compound
  30. Single crystal elasticity of lawsonite
  31. In situ measurement of viscosity of liquids in the Fe-FeS system at high pressures and temperatures
https://doi.org/10.2138/am-2000-11-1223

Articles in the same Issue

  1. Patterns of mineral occurrence in metamorphic rocks
  2. A double magmatic heat pump at the core-mantle boundary
  3. High-temperature contact metamorphism of calc-silicate xenoliths in the Kiglapait Intrusion, Labrador
  4. Multiple pyroxene and amphibole assemblages in the amphibolite facies: Bulk compositional controls
  5. Margarite-corundum phyllites from the Appalachian orogen of South Carolina: Mineralogy and metamorphic history
  6. Continuous metamorphic gradient documented by graphitization and K-Ar age, southeast Otago, New Zealand
  7. Kyanite eclogite thermobarometry and evidence for thrusting of UHP over HP metamorphic rocks, Nordøyane, Western Gneiss Region, Norway
  8. Monazite geochronology of UHP and HP metamorphism, deformation, and exhumation, Nordøyane, Western Gneiss Region, Norway
  9. Solubilities of noble metals in Fe-containing silicate melts as derived from experiments in Fe-free systems
  10. Water speciation in silicate glasses and melts: Langmuir limited site model
  11. The ab initio study of the stability of low temperature Al/Si ordered albite, NaAlSi3O8
  12. The heat capacity of MgCr2O4, FeCr2O4, and Cr2O3 at low temperatures and derived thermodynamic properties
  13. Thermodynamics of the R3̅ to R3̅c phase transition in the ilmenite-hematite solid solution
  14. An ab initio study of hydrogarnets
  15. Short-range order in synthetic aluminous tremolites: An infrared and triple-quantum MAS NMR study
  16. In-situ Raman spectroscopy of quartz: A pressure sensor for hydrothermal diamond-anvil cell experiments at elevated temperatures
  17. Modification of the hydroxyl surface of potassium acetate intercalated halloysite between 25 and 300 °C
  18. On the occurrence of anomalous fission tracks in apatite and titanite
  19. Reactivity of surface sites on fractured arsenopyrite (FeAsS) toward oxygen
  20. Surface area and porosity of primary silicate minerals
  21. Charge contrast imaging of geological materials in the environmental scanning electron microscope
  22. Chemical fine structure of Franciscan jadeitic pyroxene from Ward Creek, Cazadero area, California
  23. Crystal structure of CaMg2Al6O12, a new Al-rich high pressure form
  24. The crystal structure of “Tetragonal Almandine-Pyrope Phase” (TAPP): A reexamination
  25. The crystal structure of tetranatrolite from Mont Saint-Hilaire, Québec, and its chemical and structural relationship to paranatrolite and gonnardite
  26. Elyite, Pb4Cu(SO4)O2(OH)4·H2O: Crystal structure and new data
  27. Dukeite, Bi3+24Cr86+O57(OH)6(H2O)3, a new mineral from Brejaúba, Minas Gerais, Brazil: Description and crystal structure
  28. Pseudosinhalite is a structural isotype of chondrodite
  29. Structure type and bulk modulus of Fe3S, a new iron-sulfur compound
  30. Single crystal elasticity of lawsonite
  31. In situ measurement of viscosity of liquids in the Fe-FeS system at high pressures and temperatures
Sign up now to receive a 20% welcome discount
Institutional Access
How does access work?
Have an idea on how to improve our website?
Please write us.
© 2025 De Gruyter Brill
Downloaded on 21.9.2025 from https://www.degruyterbrill.com/document/doi/10.2138/am-2000-11-1223/html
Scroll to top button