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| Formula: |
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| System: | Trigonal | |||||||||||||||
| Name: | Named for Puebilito de Allende, Chihuahua, Mexico, where the Allende meteorite fell in 1969 | |||||||||||||||
Classification of Allendeite | |||||||||||||||||||||||||||||||
| IMA status: | Approved 2007 | ||||||||||||||||||||||||||||||
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| Dana 8th edition ID: | 4.6.8. 4 : SIMPLE OXIDES 6 : Miscellaneous | ||||||||||||||||||||||||||||||
| mindat.org URL: | http://www.mindat.org/min-32284.html Please feel free to link to this page. | ||||||||||||||||||||||||||||||
Type Occurrence of Allendeite | |||||||||||||||||||||||||||||||
| Type Locality: | Allende meteorite (Pueblito de Allende meteorite; Qutrixpileo meteorite [NHM cat.]), Pueblito de Allende, Chihuahua, Mexico | ||||||||||||||||||||||||||||||
Crystallography of Allendeite | |||||||||||||||||||||||||||||||
| Crystal System: | Trigonal | ||||||||||||||||||||||||||||||
| Class (H-M): | 3 - Rhombohedral | ||||||||||||||||||||||||||||||
| Space Group: | R3 | ||||||||||||||||||||||||||||||
| Cell Parameters: | a = 9.396Å, c = 8.72Å | ||||||||||||||||||||||||||||||
| Ratio: | a:c = 1 : 0.928 | ||||||||||||||||||||||||||||||
| Unit Cell Volume: | V 666.70 ų (Calculated from Unit Cell) | ||||||||||||||||||||||||||||||
| X-Ray Powder Diffraction: |
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Chemical Properties of Allendeite | |||||||||||||||||||||||||||||||
| Formula: |
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| Essential elements: | O, Sc, Zr | ||||||||||||||||||||||||||||||
| All elements listed in formula: | O, Sc, Zr | ||||||||||||||||||||||||||||||
Other Names for Allendeite | |||||||||||||||||||||||||||||||
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Other Information | |||||||||||||||||||||||||||||||
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. | ||||||||||||||||||||||||||||||
References for Allendeite | |||||||||||||||||||||||||||||||
| Reference List: - + | Collongues, Robert; Qucyroux, Francine; Jorba, Monique Perez y; Gilles, Jean Claude (1965): Structure and properties of the compounds of rare earth oxides with oxides of the Group IV elements. Bulletin de la Societe Chimique de France 1965, 1141-1149. Thornber, M. R.; Bevan, D. J. M.; Graham, J. (1968): Mixed oxides of the type MO2(fluorite)-M2O3. III. Crystal structures of the intermediate phases Zr5Sc2O13 and Zr3Sc4O12. Acta Crystallographica, B24, 1183-1190. Rossell, H. J. (1976): Crystal structures of some fluorite-related M7O12 compounds. Journal of Solid State Chemistry 19, 103-111. Magunov, R. L.; Shklyar, G. L.; Katridi, V. F. (1989): The phase diagrams of the zirconia (hafnia)-scandium sesquioxide systems. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy 25, 1224-1226. Red'ko, V. P.; Lopato, L. M. (1991): Crystal structure of rare earth zirconates M4Zr3O12 and hafnates M4Hf3O12 (M = rare earth). Neorganicheskie Materialy 27, 1905-1910. Bevan, D. J. M.; Mohyla, J.; Wallwork, Kia S.; Rossell, H. J.; Schweda, Eberhard (2002): Structural principles for anion-deficient, fluorite-related superstructures in the zirconia-scandia system. Zeitschrift für Anorganische und Allgemeine Chemie 628, 1180-1186. Stanek, C. R.; Jiang, C.; Uberuaga, B. P.; Sickafus, K. E.; Cleave, A. R.; Grimes, R. W. (2009): Predicted structure and stability of A4B3O12 delta-phase compositions. Physical Review B: Condensed Matter and Materials Physics 80, 174101/1-174101/11. Ma, C., J.R.Beckett & G.R.Rossman (2009): Allendeite and hexamolybdenum: two new ultra-refractory minerals in Allende and two missing links. 40th Lunar and Planetary Science Conference and Abstracts, 1402 (2009) | ||||||||||||||||||||||||||||||
Internet Links for Allendeite | |||||||||||||||||||||||||||||||
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Localities for Allendeite | |||||||||||||||||||||||||||||||
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