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Brownmillerite

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Formula:
Ca2(Al,Fe3+)2O5
Crystal System:
Orthorhombic
Name:
The artificial compound was named in 1932 for Dr. Lorrin Thomas Brownmiller (1902-1990), Chief Chemist of the Alpha Portland Cement Company, Easton, Pennsylvania, USA. The name was then transferred to the naturally-occurring mineral.
Brownmillerite-Srebrodolskite Series.

Compare also the related species shulamitite.


Hide all sections | Show all sections

Classification of BrownmilleriteHide

Approved
4.AC.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
A : Metal: Oxygen = 2:1 and 1:1
C : M:O = 1:1 (and up to 1:1.25); with large cations (+- smaller ones)
7.11.2.1

7 : MULTIPLE OXIDES
11 : Miscellaneous
7.20.15

7 : Oxides and Hydroxides
20 : Oxides of Fe

Pronounciation of BrownmilleriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Optical Data of BrownmilleriteHide

Type:
Biaxial (-)
RI values:
nα = 1.960 nβ = 2.010 nγ = 2.040
2V:
Measured: 75° , Calculated: 72°
Max Birefringence:
δ = 0.080
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong

Chemical Properties of BrownmilleriteHide

Formula:
Ca2(Al,Fe3+)2O5
IMA Formula:
Ca2Fe3+AlO5

Crystallography of BrownmilleriteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 5.57 Å, b = 14.52 Å, c = 5.34 Å
Ratio:
a:b:c = 0.384 : 1 : 0.368
Unit Cell V:
431.88 ų (Calculated from Unit Cell)
Z:
2
Comment:
Space group Ibm2. Other cell parameters given: a = 5.584(5), b = 14.60(1), c = 5.374(5) A.

Type Occurrence of BrownmilleriteHide

Place of Conservation of Type Material:
Mineral Museum, University of Cologne, Cologne, Germany (No. M5026/86)
National Museum of Natural History, Washington, D.C., USA (No. 120045)
Geological Setting of Type Material:
In thermally metamorphosed limestone blocks included in volcanic rocks
Associated Minerals at Type Locality:

Synonyms of BrownmilleriteHide

Other Language Names for BrownmilleriteHide

Relationship of Brownmillerite to other SpeciesHide

Other Members of this group:
ShulamititeCa3TiFe3+AlO8Orth. mmm (2/m 2/m 2/m) : Pmma
SrebrodolskiteCa2Fe3+2O5Orth. mmm (2/m 2/m 2/m) : Pnma
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Reinhardbraunsite1 photo of Brownmillerite associated with Reinhardbraunsite on mindat.org.
Vapnikite1 photo of Brownmillerite associated with Vapnikite on mindat.org.
Ye'elimite1 photo of Brownmillerite associated with Ye'elimite on mindat.org.
Larnite1 photo of Brownmillerite associated with Larnite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.AC.05SwedenborgiteNaBe4Sb5+O7Hex. 6mm : P63mc
4.AC.10SrebrodolskiteCa2Fe3+2O5Orth. mmm (2/m 2/m 2/m) : Pnma
4.AC.15MontroyditeHgOOrth. mmm (2/m 2/m 2/m) : Pmmn
4.AC.20LithargePbOTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
4.AC.20RomarchiteSnOTet.
4.AC.25MassicotPbOOrth. mmm (2/m 2/m 2/m) : Cmmm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.20.1WüstiteFeOIso. m3m (4/m 3 2/m) : Fm3m
7.20.2MagnetiteFe2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.20.3MaghemiteFe3+2O3Iso. 4 3 2 : P41 3 2
7.20.4HematiteFe2O3Trig. 3m (3 2/m) : R3c
7.20.5Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
7.20.6Akaganeite(Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2OMon. 2/m
7.20.7FeroxyhyteFe3+O(OH)Hex.
7.20.8Lepidocrociteγ-Fe3+O(OH)Orth. mm2 : Cmc21
7.20.9FerrihydriteFe3+10O14(OH)2Trig.
7.20.10Amakinite(Fe2+,Mg)(OH)2Trig.
7.20.11MagnesioferriteMgFe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.20.12MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m (3 2/m)
7.20.13SrebrodolskiteCa2Fe3+2O5Orth. mmm (2/m 2/m 2/m) : Pnma
7.20.14HercyniteFe2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BrownmilleriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hentschel, G., (1964): Mayenit, 12CaO 7Al2O3, und Brownmillerit, 2CaO.(Al,Fe)2O3, zwei neue Minerale in den Kalksteineinschlüssen der Lava des Ettringer Bellerberges: Neues Jahrb. Mineral., Mh. 1964, 22-29.
American Mineralogist: 50: 2106.
Acta Crystallographica: B27: 2311-2315.

Internet Links for BrownmilleriteHide

Localities for BrownmilleriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Styria
    • Bad Radkersburg
      • Klöch
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993); Postl, W. et al. (2008)
China
 
  • Xinjiang Autonomous Region
    • Hami Prefecture (Kumul Prefecture; Qumul Prefecture)
      • Hami Co. (Kumul Co.; Qumul Co.)
        • Huangshan-Jing'erquan ore belt
Jingwen Mao, Pirajno, F., Zuoheng Zang, Fengmei Chai, Hua Wu, Shiping Chen, Linsong Cheng, Jianmin Yang, and Changqing Zhang (2007): Journal of Asian Earth Sciences (in press).
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • South Moravia Region
      • Oslavany
Hršelová, P., Cempírek, J., Houzar, S., Sejkora, J. (2013): S,F,Cl-rich mineral assemblages from burned spoil heaps in the Rosice-Oslavany coalfield, Czech Republic. Can. Mineral.: 51(1): 171-188
Germany
 
  • North Rhine-Westphalia
    • Sauerland
      • Iserlohn
        • Letmathe
Bender/Marl, D. & Krimmelbein/Altena, W. (1994) Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland. Stand Juni 1994. Mineralien-Welt, 4/94, 10.; Blaß, G. & Graf, H.W. (1994) Neufunde von bekannten Fundorten (IX). Mineralien-Welt, 5 (1), 18-21.
  • Rhineland-Palatinate
    • Eifel
      • Daun
        • Üdersdorf
Schüller, W., Betz, V., Die Mineralien vom Emmelberg, Lapis 12/1986
      • Mayen
        • Ettringen
          • Bellerberg volcano
Hentschel, G. (1978): Seltene Minerale in Calcium-reichen Auswürflingen vom Bellerberg bei Mayen/Eifel, Aufschluß 29, 77-83
Sharygin, V. V. (2012). Mineralogy of metacarbonate xenolith from alkali basalt, E. Eifel, Germany. In Ore Potential of Alkaline, Kimberlite and Carbonatite Magmatism. Book of Abstracts, XXIX International Conference. Training Program: Alkaline Magmatism of the Earth, Sudak-Moscow, ONTI GEOCHI RAS (pp. 156-158).
            • Southern lava flow
Hentschel, G. (1964): Mayenit, 12CaO . 7 Al2O3, und Brownmillerit, 2CaO.(Al,Fe)2O3, zwei neue Minerale in den Kalksteineinschlüssen der Lava des Ettringer Bellerberges, Neues Jahrbuch Mineralogie, Monatshefte, 22-29
Hentschel, G. (1964): Mayenit, 12CaO . 7 Al2O3, und Brownmillerit, 2CaO.(Al,Fe)2O3, zwei neue Minerale in den Kalksteineinschlüssen der Lava des Ettringer Bellerberges, Neues Jahrbuch Mineralogie, Monatshefte, 22-29
in the collection of Christof Schäfer
Israel
 
  • Negev
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Sharygin, V.V., Sokol, E.V. & Vapnik, Ye. (2008): Minerals of the pseudobinary perovskite-brownmillerite series from combustion metamorphic larnite rocks of the Hatrurim Formation (Israel). Russian Geology and Geophysics 49, 709-726.
Jordan
 
  • Amman
Pitty, A. F., & Alexander, W. R. (2010). A natural analogue study of cement buffered, hyperalkaline groundwaters and their interaction with a repository host rock IV: an examination of the Khushaym Matruk (central Jordan) and Maqarin (northern Jordan) sites. NDA-RWMD Technical Report, NDA, Moors Row, UK.
    • Hashem region
      • Lisdan-Siwaga Fault
        • Siwaga
Khoury, H.N., Sokol, E.V., Kokh, S.N., Seryotkin, Y.V., Nigmatulina, E.N., Goryainov, S.V., Belogub, E.V., Clark, I.D. (2016): Tululite, Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36: a new Ca zincate-aluminate from combustion metamorphic marbles, central Jordan. Mineralogy and Petrology, 110, 125-140
  • Irbid
    • Maqarin area
Pitty, A. F., & Alexander, W. R. (2010). A natural analogue study of cement buffered, hyperalkaline groundwaters and their interaction with a repository host rock IV: an examination of the Khushaym Matruk (central Jordan) and Maqarin (northern Jordan) sites. NDA-RWMD Technical Report, NDA, Moors Row, UK.
Palestine
 
  • West Bank
    • Hatrurim Formation
Galuskin, E., Galuskina, I., Kusz, J., Armbruster, T., Marzec, K., Dzierżanowski, P., Murashko, M. (2014): Vapnikite Ca3UO6 - a new double perovskite mineral from pyrometamorphic larnite rocks of the Jabel Harmun, Palestine Autonomy, Israel. Mineralogical Magazine, 78, 571-581
Sokol, E.V., Gaskova, O.L., Kokh, S.N., Kozmenko, O.A., Seryotkin, Y.V., Vapnik, Y., Murashko, M.N. (2011): Chromatite and its Cr3+- and Cr6+-bearing precursor minerals from the Nabi Musa Mottled Zone complex, Judean Desert. American Mineralogist 96, 659-674.
Ella V. Sokol, Olga L. Gaskova, Svetlana N. Kokh, Olga A. Kozmenko, Yuri V. Seryotkin, Yevgeny Vapnik, and Michail N. Murashko (2011): Chromatite and its Cr3+- and Cr6+-bearing precursor minerals from the Nabi Musa Mottled Zone complex, Judean Desert. American Mineralogist, 96, 659-674.
Romania
 
  • Brașov Co.
    • Racoş Commune
Szakáll, S., Kristály, F., 2010. Mineralogy of Székelyland, Eastern Transylvania, Romania. Sfântu Gheorghe-Miercurea Ciuc-Târgu Mureş. 2010.
  • Harghita Co.
    • Odorheiu Secuiesc (Székelyudvarhely; Oderhellen)
      • Racoş (Racoşu de Jos)
Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
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