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Brackebuschite

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Venus Mine, Venus Pb-Zn deposit, Sierra de Córdoba, Córdoba, Argentina
© Stephan Wolfsried

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Formula:
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
System:MonoclinicColour:Dark brown to black; ...
Hardness:4 - 5
Name:After Argentinian mineralogist Luis Brackebusch (1849-1906), Professor of Mineralogy, University of Córdoba, Córdoba, Argentina.


Brackebuschite Group .

A rare secondary mineral occurring in the oxidized zones of hydrothermal Pb-Zn deposits.

Classification of Brackebuschite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/B.24-30
Nickel-Strunz 10th (pending) edition ID:8.BG.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
Dana 8th edition ID:40.2.8.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Hey's CIM Ref.:21.4.18

21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
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Type Occurrence of Brackebuschite

Type Locality:Venus Mine, Venus Pb-Zn deposit, Sierra de Córdoba, Córdoba, Argentina
Place of Conservation of Type Material:The Natural History Museum, London, England: #55819. Harvard University, Cambridge, Massachusetts, USA: #96255.
Year of Discovery:1880

Physical Properties of Brackebuschite

Lustre:Sub-Metallic
Diaphaneity (Transparency):Translucent, Opaque
Colour:Dark brown to black; reddish brown in transmitted light.
Streak:Yellow
Hardness (Mohs):4 - 5
Density (measured):6.05 - 6.11 g/cm3

Crystallography of Brackebuschite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 8.88Å, b = 6.155Å, c = 7.681Å
β = 111.5°
Ratio:a:b:c = 1.443 : 1 : 1.248
Unit Cell Volume:V 390.60 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals commonly acicular, elongated and striated parallel [010]; may be lathlike or wedge-shaped, flattened on {001}, with {100}, {001}, {011}, {102}, {103}, and others, perhaops without terminal faces; sprays, dendritic, botryoidal.
Comment:β = 111.5 - 111.833
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Brackebuschite

Type:Biaxial (+)
RI values: nα = 2.280 nβ = 2.360 - 2.380 nγ = 2.480 - 2.490
2V:Calculated: 82° to 88°
Maximum Birefringence:δ = 0.200 - 0.210

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v strong
Pleochroism:Visible
Comments:X = Nearly colourless
Y = Dark reddish brown
Z = Reddish brown

Chemical Properties of Brackebuschite

Formula:
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
Essential elements:H, Mn, O, Pb, V
All elements listed in formula:Fe, H, Mn, O, Pb, V

Relationship of Brackebuschite to other Species

Member of Group:
Brackebuschite Group:
M
2+
2
M
3+
 
[OH|(TO
 
4
)
 
2
]
Common Associates:
WulfeniteVanadiniteDescloiziteCerussite
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bearthite
Ca
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Goedkenite
(Sr,Ca)
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
CuOHPO
 
4
(Mo,As,Cr,Ga)O
 
4
8.BG.05Tsumebite
Pb
 
2
Cu[OH|SO
 
4
|PO
 
4
]
8.BG.05Arsenbrackebuschite
Pb
 
2
(Fe
3+
 
,Zn
2+
 
)[(OH,H
 
2
O)|(AsO
 
4
)
 
2
]
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bushmakinite
Pb
 
2
Al[OH|PO
 
4
|VO
 
4
]
8.BG.05Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
[OH|(VO
 
4
)
 
2
]
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
[OH|(PO
 
4
)
 
2
]
8.BG.15Tancoite
LiNa
 
2
Al[OH|HPO
 
4
|PO
 
4
]
Related Minerals - Hey's Index Grouping:

- +
21.4.1Uvanite
U
 
2
V
 
6
O
 
21
·15H
 
2
O
21.4.2Vanuranylite
(H
 
3
O)
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 4H
 
2
O
21.4.3Strelkinite
Na
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 6H
 
2
O
21.4.4Carnotite
K
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 3H
 
2
O
21.4.5Margaritasite
(Cs,K,H
 
3
O)
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · H
 
2
O
21.4.6Sengierite
Cu
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 6H
 
2
O
21.4.7Metatyuyamunite
Ca(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 3-5H
 
2
O
21.4.8Tyuyamunite
Ca(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 5-8H
 
2
O
21.4.9Rauvite
Ca(UO
 
2
)
 
2
V
 
10
O
 
28
·16H
 
2
O
21.4.10Francevillite
(Ba,Pb)(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 5H
 
2
O
21.4.11Metavanuralite
Al(UO
 
2
)
 
2
[OH|(VO
 
4
)
 
2
] · 8H
 
2
O
21.4.12Vanuralite
Al(UO
 
2
)
 
2
[OH|(VO
 
4
)
 
2
] · 11H
 
2
O
21.4.13Curienite
Pb(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 5H
 
2
O
21.4.14Fritzscheite
Mn(UO
 
2
)
 
2
(PO
 
4
,VO
 
4
)
 
2
·10H
 
2
O (?)
21.4.15Palenzonaite
(Ca,Na)
 
3
CaMn
2+
2
[VO
 
4
]
 
3
21.4.16Santafeite
(Ca,Sr,Na)
 
12
(Mn
2+
 
,Fe
3+
 
,Al,Mg)
 
8
Mn
4+
8
(VO
 
4
)
 
16
(OH,O)
 
20
 · 8H
 
2
O
21.4.17Pyrobelonite
PbMn
2+
 
[OH|VO
 
4
]
21.4.19Čechite
Pb(Fe
2+
 
,Mn
2+
 
)[OH|VO
 
4
]
21.4.20Heyite
Pb
 
5
Fe
2+
2
[O
 
2
|VO
 
4
]
 
2
21.4.21Mounanaite
PbFe
3+
2
[VO
 
4
]
 
2
 · 2(OH,F)
21.4.22Schubnelite
Fe
 
2-x
V
 
2
O
 
4
(OH)
 
4
21.4.23Fervanite
Fe
 
4
(VO
 
4
)
 
4
·5H
 
2
O
21.4.24Kazakhstanite
Fe
 
5
V
 
3
V
 
12
O
 
39
(OH)
 
9
·9H
 
2
O
21.4.25Bokite
(Al,Fe
3+
 
)
 
1.3
[(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
4
O
 
10
]
 
2
 · 7.5H
 
2
O
21.4.26Rusakovite
(Fe
3+
 
,Al)
 
5
[(OH)
 
9
|(VO
 
4
,PO
 
4
)
 
2
] · 3H
 
2
O
21.4.27Kolovratite
(Zn,Ni,Cu)
 
2-5
Al
 
4-6
(Si,V
4+
 
,V
5+
 
)
 
4
(O,OH)
 
20
·7.5H
 
2
O

Other Names for Brackebuschite

Other Languages:
German:Brackebuschit
Russian:Бракебушит
Spanish:Brackebuschita

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 Brackebuschite

Reference List:Rammelsberg (1880) Zeitschrift der Deutsche geologische Gesellschaft, Berlin: 32: 711 (cites Doering).

Doering (1883) Bol. ac. cienc. Córdoba: 5: 501.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 146.

Berry, L.G. and A.R. Graham (1948) X-ray measurements on brackebuschite and hematolite. American Mineralogist: 33: 489–495.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1052-1053.

Donaldson, D.M. and W.H. Barnes (1955) The structures of the minerals of the descloizite and adelite groups: III –
brackebuschite. American Mineralogist: 40: 597-613.

Fanfani, L. and P.F. Zanazzi (1967) Structural similarities of some secondary lead minerals. Mineralogical Magazine, 36, 522–529.

Symes, R.F. and S.A. Williams (1973) Heyite and brackebuschite compared. Mineralogical Magazine, 39, 69–73.

Foley, J. A., Hughes, J. M. and Lange, D. (1997): The atomic arrangement of brackebuschite, redefined as Pb2(Mn3+,Fe3+)(VO4)2(OH), and comments on Mn3+ octahedra: Canadian Mineralogist: 35, 1027-1033.

Internet Links for Brackebuschite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Brackebuschite in the Natural History Museum (London) online catalogue
  • Brackebuschite details from Handbook of Mineralogy (PDF)
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    Localities for Brackebuschite

    Hide Locality List
    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.
    (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.
    Argentina
     
    • Córdoba
      • Minas Department
    		Sureda (1978): Revista de la Asociacion Geologica Argentina 33(4):299-324
      • Sierra de Córdoba
        • Venus Pb-Zn deposit
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1053; Mineralogical Magazine (1973): 39: 69; Canadian Mineralogist (1997): 35: 1027; Lapis (2004): 29(1): 46.
    Gabon
     
    • Haut-Ogooué Province
      • Franceville
    		P. Bariand et al. , Bull. Soc. Franç. Minéral. Cristal. , 1963, LXXXVI, pp. 117-120.
    Germany
     
    • Saarland
      • Wadern
        • Krettnich
    		[Eur.J.Mineral. 13:145-158]
    Spain
     
    • Andalusia
      • Almería
        • Níjar
          • Rodalquilar
    		J Gröbner collection
    USA
     
    • Arizona
      • Cochise Co.
        • Swisshelm Mts
          • Swisshelm District
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 144.
        • Tombstone Hills
          • Tombstone District
    		Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 77.
      • Santa Cruz Co.
        • Patagonia Mts
          • Palmetto District
            • Fresno Canyon
              • Tres de Mayo Mine group
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 144.
    • Colorado
      • Montrose Co.
        • Uravan District
          • Paradox Valley
    		http://rruff.geo.arizona.edu/doclib/hom/brackebuschite.pdf
    Mineral and/or Locality
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