Brownmillerite (original) (raw)

A valid IMA mineral species

About BrownmilleriteHide

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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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:790:2

e7a7e9e4-fbda-44a1-a7be-5cc8123cc1d6

IMA Classification of BrownmilleriteHide

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Classification of BrownmilleriteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Pronunciation of BrownmilleriteHide

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Pronunciation:

Physical Properties of BrownmilleriteHide

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Transparency:

Transparent, Translucent

Density:

3.76 g/cm3 (Measured) 3.70 g/cm3 (Calculated)

Optical Data of BrownmilleriteHide

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RI values:

_n_α = 1.960 _n_β = 2.010 _n_γ = 2.040

2V:

Measured: 75° , Calculated: 72°

δ = 0.080

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of BrownmilleriteHide

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Mindat Formula:

Ca2(Al,Fe3+)2O5

Crystallography of BrownmilleriteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - 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)

Comment:

Space group Ibm2. Other cell parameters given: a = 5.584(5), b = 14.60(1), c = 5.374(5) A.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0003433	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003434	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003435	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003436	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003437	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003438	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003439	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003440	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003441	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0003442	Brownmillerite	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 deg C and high temperature X-ray powder diffraction (25 C <= T <= 1000 C) American Mineralogist 89 405-420		2004	synthetic	0	293
0017771	Brownmillerite	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	2008	synthetic	0.0001	293
0017772	Brownmillerite	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	2008	synthetic	1.49	293
0017773	Brownmillerite	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	2008	synthetic	3.21	293
0017774	Brownmillerite	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	2008	synthetic	4.511	293
0017775	Brownmillerite	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	2008	synthetic	6.27	293
0017776	Brownmillerite	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	2008	synthetic	7.73	293
0009418	Brownmillerite	Colville A A, Geller S (1971) The crystal structure of brownmillerite, Ca2FeAlO5 Acta Crystallographica B27 2311-2315		1971	synthetic	0	293
0009431	Brownmillerite	Colville A, Geller S (1972) Crystal structures of Ca2Fe1.43Al0.57O5 and Ca2Fe1.28Al0.72O5 _cod_database_code 1000040 Acta Crystallographica B28 3196-3200		1972	synthetic	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Hentschel (1964)

Geological EnvironmentHide

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Geological Setting:

In thermally metamorphosed limestones

Type Occurrence of BrownmilleriteHide

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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

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Other Language Names for BrownmilleriteHide

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Relationship of Brownmillerite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of BrownmilleriteHide

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Other InformationHide

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Health Risks:

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

Internet Links for BrownmilleriteHide

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References for BrownmilleriteHide

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Localities for BrownmilleriteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Austria
Styria Südoststeiermark District Klöch ⓘ Basalt quarry	Exel (1993) +1 other reference
China
Xinjiang Hami Prefecture (Kumul Prefecture; Qumul Prefecture) Yizhou District Huangshan-Jing'erquan ore belt ⓘ Xiangshan Cu-Ni-V-Ti deposit	Jingwen Mao et al. (2007)
Czech Republic
South Moravian Region Brno-Country District Oslavany ⓘ Rosice-Oslavany coalfield	Hršelová et al. (2013)
Germany
North Rhine-Westphalia Arnsberg Märkischer Kreis Iserlohn Letmathe Helmke quarry nature reserve ⓘ Genna zinc smelter slag locality	Bender et al. (1994) +1 other reference
Rhineland-Palatinate Mayen-Koblenz Mayen ⓘ Mayener Feld (TL)	Hentschel (1964)
ⓘ Seekante	in the collection of Christof Schäfer
ⓘ Xenolith CS-008 (Bellbergite-bearing xenolith)	in the collection of Christof Schäfer
ⓘ Xenolith CS-020	Skrzyńska et al. (2023)
Vordereifel Ettringen ⓘ Caspar quarry	Hentschel (1978)
ⓘ E-2011 xenolith	Sharygin (2012)
ⓘ Xenolith CS-050	in the collection of Christof Schäfer
ⓘ Ettringer Feld (TL)	Hentschel (1964)
Vulkaneifel Daun Üdersdorf ⓘ Emmelberg	Schüller et al. (1986)
Israel
Southern District (HaDarom District) Arad ⓘ Arad Stone Quarry	Krüger +2 other references
Tamar Regional Council ⓘ Hatrurim Basin	Sharygin et al. (2008)
ⓘ Aravaite type locality	doi:10.3390/min8030109. +2 other references
ⓘ Nahal Morag Canyon	Sharygin +7 other references
Jordan
Amman Governorate Transjordan Plateau Daba-Siwaqa complex ⓘ Daba	Pitty et al. (2010)
Hashem region Lisdan-Siwaga Fault ⓘ Jordan Areva Resources	Fleurance et al. (2013)
Siwaga ⓘ Tulul al Hammam	Khoury et al. (2015) +2 other references
ⓘ Unnamed marble quarries	Sokol +9 other references
ⓘ North Siwaqa complex	Juroszek et al. (2020)
Irbid Governorate Maqarin area ⓘ Yarmouk river	Pitty et al. (2010)
Middle East
ⓘ Hatrurim Formation	Gross (1977)
Palestine
West Bank Bethlehem Governorate ⓘ Nahal Darga	Galuskina et al. (2019)
Jericho Governorate ⓘ Nabi Musa	Ella V. Sokol et al. (2011)
Quds Governorate ⓘ Jebel Harmun (Jabel Harum)	Galuskin et al. (2014)
ⓘ Ma'ale Adumim	Sokol et al. (2011)
Romania
Brașov County ⓘ Racoş (Racoşul de Jos)	Szakáll
ⓘ Basalt quarry	Szakáll et al. (2010)
Russia
Murmansk Oblast Kolsky District ⓘ Tepsi ultrabasic body	Barkov et al. (2024)
Ukraine
Donetsk Oblast ⓘ Donetsk	V.V. Sharygin (2011)