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Name: Brownmillerite RRUFF ID: R130105 Ideal Chemistry: Ca2Fe3+AlO5 Locality: Ettringer Feld, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany Source: Donald Doell [view label] Owner: RRUFF Description: Brownish-red platy crystals. Diffraction indicates an I-centered lattice Status: The identification of this mineral has been confirmed by single-crystal X-ray diffraction. |
Mineral Groups: [ Brownmillerite (2) ] [ Perovskite (44) ] |
RAMAN SPECTRUM | ||||||||||||
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BROAD SCAN WITH SPECTRAL ARTIFACTS | ||||||||||||
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POWDER DIFFRACTION | |||||||
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RRUFF ID: | R130105.9 | ||||||
Sample Description: | Single crystal, powder profile is calculated | ||||||
Cell Refinement Output: |
a: 5.353(1)Å b: 14.504(3)Å c: 5.583(1)Å alpha: 90° beta: 90° gamma: 90° Volume: 433.4(1)Å3 Crystal System: orthorhombic |
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REFERENCES for Brownmillerite | |
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American Mineralogist Crystal Structure Database Record: [view record] |
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Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file] |
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Bertaut E F, Blum P, Sagnières A (1959) Structure du ferrite bicalcique et de la brownmillerite, Acta Crystallographica, 12, 149-159 |
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Hentschel G (1964) Mayenit, 12CaO·7Al2O3, und Brownmillerit, 2CaO·(Al,Fe)2O3, zwei neue Minerale in den Kalksteinschlüssen der Lava des Ettringer Bellerberges, Neues Jahrbuch für Mineralogie, Monatshefte, 1964, 22-29 |
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Fleischer M (1965) New mineral names, American Mineralogist, 50, 2096-2111 [view file] |
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Colville A A, Geller S (1971) The crystal structure of brownmillerite, Ca2FeAlO5, Acta Crystallographica, B27, 2311-2315 |
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Redhammer G J, Tippelt G, Roth G, Amthauer G (2004) Structural variations in the brownmillerite series Ca2(Fe2-xAlx)O5: Single-crystal X-ray diffraction at 25°C and high-temperature X-ray powder diffraction (25°C< T <1000°C), American Mineralogist, 89, 405-420 [view file] |
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Vanpeteghem C B, Angel R J, Zhao J, Ross N L, Redhammer G J, Seifert F (2008) The effect of oxygen vacancies and aluminium substitution on the high-pressure properties of brownmillerite-structured Ca2Fe2-xAlxO5, Physics and Chemistry of Minerals, 35, 493-504 |
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Mitchell R H, Welch M D, Chakhmouradian A R (2017) Nomenclature of the perovskite supergroup: A hierarchical system of classification based on crystal structure and composition, Mineralogical Magazine, 81, 411-461 [view file] |
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