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Brearleyite

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Formula:
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
System:Isometric
Member of:Mayenite Group
Name:Adrian J. Brearley (1958-), a mineralogist at the University of New Mexico, in recognition of his many contributions to meteorite mineralogy.
Isostructural with:Mayenite


Derivative of mayenite.
Water-free analogue of kyuygenite.

A considerable number of reported "mayenites" may in fact be brearleyite according to Galushkin et al. (2010).

Classification of Brearleyite

IMA status:Approved 2010
Nickel-Strunz 10th (pending) edition ID:4.CC.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
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Type Occurrence of Brearleyite

Type Locality:NWA 1934 CV3 Carbonaceous chondrite meteorite, Rissani, Erfoud (Erfud), Er Rachidia Province, Meknès-Tafilalet Region, Morocco
General Appearance of Type Material:Fine-grained aggregates.
Place of Conservation of Type Material:Smithsonian Institution’s National Museum of Natural History, Washington, D.C., USA: USNM 7590.
Geological Setting of type material:In a krotite dominant refractory inclusion from a carbonaceous chondrite meteorite.
Associated Minerals at type locality:
PerovskiteKrotiteHercyniteGehlenite

Physical Properties of Brearleyite

Diaphaneity (Transparency):Transparent
Hardness Data:Could not be measured
Density (calculated):2.797 g/cm3

Crystallography of Brearleyite

Crystal System:Isometric
Class (H-M):4 3m - Hextetrahedral
Space Group:I4 3d
Cell Parameters:a = 11.9794(5) Å
Unit Cell Volume:V 1,719.12 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
3.001 (41)
2.685 (100)
2.451 (55)
2.192 (33)
1.947 (24)
1.665 (42)
1.604 (61)
1.310 (22)

Optical Data of Brearleyite

Type:Isotropic
RI values: n = 1.600
Maximum Birefringence:δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:Moderate

Chemical Properties of Brearleyite

Formula:
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
Essential elements:Al, Ca, Cl, O
All elements listed in formula:Al, Ca, Cl, O
Analytical Data:Average of 10 electron microprobe analyses; Northwest Africa 1934 CV3 carbonaceous chondrite.
SiO2 (<0.04)
TiO2 (0.03)
Al2O3 (48.48)
FeO (0.80)
MgO (<0.02)
CaO (45.73)
Na2O (0.12)
Cl (5.12)
ZnO (<0.06)
O=Cl (-1.16)
Total (99.12)
Empirical Formula:
(Ca
 
11.91
Na
 
0.06
)(Al
 
13.89
Fe
2+
0.16
Ti
4+
0.01
)O
 
31.89
Cl
 
2.11

Relationship of Brearleyite to other Species

Member of:Mayenite Group
Other Members of Group:

- +
Kyuygenite
Ca
 
12
Al
 
14
O
 
32
[(H
 
2
O)
 
4
Cl
 
2
]
Mayenite
Ca
 
12
Al
 
14
O
 
33
Related Minerals - Nickel-Strunz Grouping):

- +
4.CC.05Chrombismite
Bi
 
16
CrO
 
27
4.CC.10Freudenbergite
Na
 
2
(Ti,Fe)
 
8
O
 
16
4.CC.15Grossite
CaAl
 
4
O
 
7
4.CC.20Mayenite
Ca
 
12
Al
 
14
O
 
33
4.CC.25Yafsoanite
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
4.CC.30Latrappite
(Ca,Na)(Nb,Ti,Fe)O
 
3
4.CC.30Lueshite
NaNbO
 
3
4.CC.30Natroniobite
NaNbO
 
3
4.CC.30Perovskite
CaTiO
 
3
4.CC.30Barioperovskite
BaTiO
 
3
4.CC.30Lakargiite
Ca(Zr,Sn,Ti)O
 
3
4.CC.30Megawite
CaSnO
 
3
4.CC.35Loparite-(Ce)
(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O
 
3
4.CC.35Macedonite
PbTiO
 
3
4.CC.35Tausonite
SrTiO
 
3
4.CC.35Isolueshite
(Na,La,Ca)(Nb,Ti)O
 
3
4.CC.40Crichtonite
(Sr,La,Ce,Y)(Ti,Fe
3+
 
,Mn)
 
21
O
 
38
4.CC.40Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(Y)
(La,Ce,Na,Ca,Pb)(Y,Fe
2+
 
,◻)(Fe
2+
 
,Mn
2+
 
)
 
2
(Ti,Fe
3+
 
,Nb,Zr)
 
18
O
 
38
 (hypothetical)
4.CC.40Landauite
NaMnZn
 
2
(Ti,Fe)
 
6
Ti
 
12
O
 
38
4.CC.40Lindsleyite
(Ba,Sr)(Ti,Zr,Fe,Cr)
 
21
O
 
38
4.CC.40Loveringite
(Ca,Ce)(Ti,Fe,Cr,Mg)
 
21
O
 
38
4.CC.40Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
4.CC.40Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38
4.CC.40Dessauite-(Y)
(Sr,Pb)(Y,U)(Ti,Fe
3+
 
)
 
20
O
 
38
4.CC.40Cleusonite
(Pb,Sr)(U
4+
 
,U
6+
 
)(Fe
2+
 
,Zn)
 
2
(Ti,Fe
2+
 
,Fe
3+
 
)
 
18
(O,OH)
 
38
4.CC.40Gramaccioliite-(Y)
(Pb,Sr)(Y,Mn)Fe
3+
2
(Ti,Fe
3+
 
)
 
18
O
 
38
4.CC.45Diaoyudaoite
NaAl
 
11
O
 
17
4.CC.45Hawthorneite
Ba(MgTi
 
3
Cr
 
4
Fe
 
4
)O
 
19
4.CC.45Hibonite
(Ca,Ce)Al
 
12
O
 
19
4.CC.45Lindqvistite
Pb
 
2
Mn
2+
 
Fe
 
16
O
 
27
4.CC.45Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
4.CC.45Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
4.CC.45Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
4.CC.45Haggertyite
Ba[Fe
2+
6
Ti
 
5
Mg]O
 
19
4.CC.45Nežilovite
PbZn
 
2
(Mn
4+
 
,Ti
4+
 
)
 
2
Fe
3+
8
O
 
19
4.CC.45Batiferrite
Ba[Ti
 
2
Fe
3+
8
Fe
2+
2
]O
 
19
4.CC.45IMA2009-027
(Fe,Mg)Al
 
12
O
 
19
4.CC.45Barioferrite
BaFe
3+
12
O
 
19
4.CC.50Jeppeite
(K,Ba)
 
2
(Ti,Fe)
 
6
O
 
13
4.CC.55Zenzénite
Pb
 
3
(Fe,Mn)
 
4
Mn
 
3
O
 
13
4.CC.60Mengxianminite
(Ca,Na)
 
3
(Fe,Mn)
 
2
Mg
 
2
(Sn,Zn)
 
5
Al
 
8
O
 
29

Other Names for Brearleyite

Synonyms:
IMA2010-062
Other Languages:

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 Brearleyite

Reference List:

- +
Bailau, R., Galuskin, E.V., Gazeev, V.M. & Pertsev, N.N. (2010): Classification and potential new minerals in the “mayenite group”. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 493.

Ma, C., Sweeney Smith, S.A., Connolly, H.C., Beckett, J.R., Rossman, G.R., Schrader, D.L. (2010): Discovery of Cl-bearing mayenite, Ca12Al14O32Cl2, a new mineral in a CV3 Meteorite. 73rd Annual Meteoritical Society Meeting, 2010, 5134.pdf.

Ma, C., Connolly, Jr., H.C., Beckett, J.R., Rossman, G.R., Kampf, A.R., Zega, T.J., Tschauner, O., Sweeney Smith, S.A. and Schrader, D.L. (2010) Brearleyite, IMA 2010-062. CNMNC Newsletter No. 7, February 2010, page 31; Mineralogical Magazine, 75, 27-31.

Ma, C., Connolly, Jr., H.C., Beckett, J.R., Tschauner, O., Rossman, G.R., Kampf, A.R., Zega, T.J., Sweeney Smith, S.A. and Schrader, D.L. (2011): Brearleyite, Ca12Al14O32Cl2, a new alteration mineral from the NWA 1934 meteorite. American Mineralogist, 96, 1199-1206.

Internet Links for Brearleyite

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    • Localities for Brearleyite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Mayen
          • Ettringen
            • Bellerberg volcano
    		EMPA data, Sharygin V.V.
    Morocco
     
    • Meknès-Tafilalet Region
      • Er Rachidia Province
        • Erfoud (Erfud)
          • Rissani
    		Ma, C., Connolly, Jr., H.C., Beckett, J.R., Rossman, G.R., Kampf, A.R., Zega, T.J., Tschauner, O., Sweeney Smith, S.A. and Schrader, D.L. (2010) Brearleyite, IMA 2010-062. CNMNC Newsletter No. 7, February 2010, page 31; Mineralogical Magazine, 75, 27-31.
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