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Mansfieldite

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Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France
© jm.CLAUDE

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Formula:
AlAsO
 
4
·2H
 
2
O
System:OrthorhombicColour:White, light gray; ...
Hardness:3½ - 4
Name:After George R. Mansfield (1875- ), American geologist, U.S. Geological Survey.


Variscite Group; Mansfieldite-Scorodite Series. The aluminium analogue of Scorodite.

Classification of Mansfieldite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.09-70
Nickel-Strunz 10th (pending) edition ID:8.CD.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
Dana 8th edition ID:40.4.1.4

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Hey's CIM Ref.:20.4.1

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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Type Occurrence of Mansfieldite

Type Locality:Hobart Butte, Black Butte District, Lane Co., Oregon, USA
Year of Discovery:1948
Associated Minerals at type locality:
ScoroditeRealgarKaolinite

Physical Properties of Mansfieldite

Diaphaneity (Transparency):Transparent
Colour:White, light gray; colourless in transmitted light.
Hardness (Mohs):3½ - 4
Cleavage:Imperfect/Fair
On {201}, imperfect; on {001} and {100} in traces.
Fracture:Sub-Conchoidal
Density (measured):3.03 g/cm3
Comment:Measured value on Hobart Butte material.

Crystallography of Mansfieldite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbca (P21/b 21/c 21/a)
Cell Parameters:a = 8.8218Å, b = 9.8252Å, c = 10.1163Å
Ratio:a:b:c = 0.898 : 1 : 1.03
Unit Cell Volume:V 876.8 ų
Morphology:Porous, cellular masses and crusts of spherulitic fibers.

Optical Data of Mansfieldite

Type:Biaxial (+)
RI values: nα = 1.622 - 1.631 nβ = 1.624 - 1.649 nγ = 1.642 - 1.663
2V:Measured: 30° to 68°, Calculated: 38° to 82°
Maximum Birefringence:δ = 0.020 - 0.032

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Mansfieldite

Formula:
AlAsO
 
4
·2H
 
2
O
Essential elements:Al, As, H, O
All elements listed in formula:Al, As, H, O

Relationship of Mansfieldite to other Species

Series:Forms a series with Scorodite (see here)
Related to:
  • Variscite Group
    • Related Minerals - Nickel-Strunz Grouping):

    - +
    8.CD.05Kolbeckite
    ScPO
     
    4
    		·2H
     
    2
    		O
    8.CD.05Metavariscite
    AlPO
     
    4
    		·2H
     
    2
    		O
    8.CD.05Phosphosiderite
    FePO
     
    4
    		·2H
     
    2
    		O
    8.CD.05UM2005-02
    ScAsO
     
    4
    		·2H
     
    2
    		O
    8.CD.10Scorodite
    Fe
    3+
     
    		AsO
     
    4
    		·2H
     
    2
    		O
    8.CD.10Strengite
    FePO
     
    4
    		·2H
     
    2
    		O
    8.CD.10Variscite
    AlPO
     
    4
    		·2H
     
    2
    		O
    8.CD.10Yanomamite
    InAsO
     
    4
    		·2H
     
    2
    		O
    8.CD.15Parascorodite
    Fe
    3+
     
    		AsO
     
    4
    		·2H
     
    2
    		O
    8.CD.20Ludlamite
    (Fe,Mn,Mg)
     
    3
    		(PO
     
    4
    		)
     
    2
    		·4H
     
    2
    		O
    8.CD.25Sterlinghillite
    Mn
     
    3
    		(AsO
     
    4
    		)
     
    2
    		·4H
     
    2
    		O
    8.CD.30Rollandite
    Cu
     
    3
    		(AsO
     
    4
    		)
     
    2
    		·4H
     
    2
    		O
    Related Minerals - Hey's Index Grouping:

    - +
    20.4.2Bulachite
    Al
     
    2
    		[(OH)
     
    3
    		|AsO
     
    4
    		] · 3H
     
    2
    		O
    20.4.3Alumopharmacosiderite
    KAl
     
    4
    		[(OH)
     
    4
    		|(AsO
     
    4
    		)
     
    3
    		] · 6-7H
     
    2
    		O
    20.4.4Luetheite
    Cu
     
    2
    		Al
     
    2
    		[(OH)
     
    2
    		|AsO
     
    4
    		]
     
    2
    20.4.5Arsenogoyazite
    SrAl
     
    3
    		[(OH)
     
    5
    		|(AsO
     
    4
    		)
     
    2
    		] · H
     
    2
    		O
    20.4.6Arsenocrandallite
    (Ca,Sr)Al
     
    3
    		[(OH)
     
    5
    		|(AsO
     
    4
    		,PO
     
    4
    		)
     
    2
    		] · H
     
    2
    		O
    20.4.7Arsenoflorencite-(Ce)
    CeAl
     
    3
    		[(OH)
     
    6
    		|(AsO
     
    4
    		)
     
    2
    		]
    20.4.8Arsenoflorencite-(La)
    LaAl
     
    3
    		[(OH)
     
    6
    		|(AsO
     
    4
    		)
     
    2
    		]
    20.4.9Arsenoflorencite-(Nd)
    NdAl
     
    3
    		[(OH)
     
    6
    		|(AsO
     
    4
    		)
     
    2
    		]
    20.4.10Gerdtremmelite
    (Zn,Fe)(Al,Fe)
     
    2
    		AsO
     
    4
    		(OH)
     
    5
    20.4.11Gasparite-(Ce)
    (Ce,REE)AsO
     
    4
    20.4.12Chernovite-(Y)
    YAsO
     
    4
    20.4.13Agardite-(Y)
    (Y,Ca)Cu
     
    6
    		[(OH)
     
    6
    		|(AsO
     
    4
    		,HAsO
     
    4
    		)|(AsO
     
    4
    		)
     
    2
    		] · 3H
     
    2
    		O
    20.4.14Agardite-(La)
    (La,Ce)Cu
     
    6
    		[(OH)
     
    6
    		|(AsO
     
    4
    		)
     
    3
    		] · 3H
     
    2
    		O
    20.4.15Goudeyite
    (Al,Y)Cu
     
    6
    		[(OH)
     
    6
    		|(AsO
     
    4
    		)
     
    3
    		] · 3H
     
    2
    		O
    20.4.16Retzian-(Ce)
    Mn
    2+
    2
    		Ce(AsO
     
    4
    		)(OH)
     
    4
    20.4.17Retzian-(La)
    (Mn
    2+
     
    		,Mg)
     
    2
    		(La,Ce,Nd)(AsO
     
    4
    		)(OH)
     
    4
    20.4.18Retzian-(Nd)
    Mn
    2+
    2
    		(Nd,Ce,La)(AsO
     
    4
    		)(OH)
     
    4

    Other Names for Mansfieldite

    Other Languages:
    German:Mansfieldit
    Russian:Мансфильдит
    Spanish:Mansfieldita
    Varieties:
    Cobaltian MansfielditeCuprian Mansfieldite

    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 Mansfieldite

    Reference List:Allen, V.T., Fahey, J.J., Axelrod, J.M. (1948): Mansfieldite, a new arsenate, the aluminum analogue of scorodite, and the mansfieldite-scorodite series. American Mineralogist: 33: 122-134.

    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.: 763.

    Neues Jahrbuch für Mineralogie, Monatshefte (1963): 79-87.

    Harrison, W. T. A. (2000): Synthetic mansfieldite, AlAsO4•2H2O. Acta Crystallogr. C56, e421.

    Articles/Blogs about Mansfieldite

    Internet Links for Mansfieldite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Mansfieldite in the Natural History Museum (London) online catalogue
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    Localities for Mansfieldite

    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.
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    (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.
    Australia
     
    • Queensland
      • Mt Isa - Cloncurry area
        • Cloncurry District
          • Starra (Selwyn)
    		[UKJMM 19:24]
    • Western Australia
      • Wyloo
    		Lead, Zinc and Silver Deposits of Western Australia, 1999
    Belgium
     
    • Luxembourg Province
      • Stavelot Massif
        • Vielsalm
          • Grand Halleux
    		http://users.skynet.be/jose.dehove/photos/Hourt.htm
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Santa Catalina
    		No reference listed
    Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
    maurizio dini collection
    Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 4, 2000
    • Atacama Region
      • Copiapó Province
        • Tierra Amarilla
          • Pampa Larga district
    		Uwe Kolitsch (powder XRD)
      • Huasco Province
        • Freirina
    		Josef Vajdak (2002) Mineral News, 18, #1, 6.
    China
     
    • Sichuan Province
      • Ngawa (Aba) Autonomous Prefecture
        • Ruo'ergai Co. (Zoigê Co.)
          • Western Qinling gold belt
    		http://www.cicresources.com/PDF_REPORTS/Pingding_F1ReportFinal.pdf
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
    		No reference listed
          • Krásno
    		Sejkora, J., Ondruš, P., Fikar, M., Veselovský, F., Mach, Z., Gabašová, A., Skoda, R. & Beran, P. (2006): Supergene minerals at the Huber stock and Schnöd stock deposits, Krásno ore District, the Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 57-101.
    France
     
    • Provence-Alpes-Côte d'Azur
      • Var
        • Pradet
    		[UKJMM 2:11-15 "Cap Gronne Secondary Copper and Lead - W.R. van den Berg"]
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Calw
    		Walenta, K. (1963): Mansfieldit von Neubulach im württembergischen Schwarzwald. N. Jb. Mineral. Mh. 1963, 79-87.
    • Rhineland-Palatinate
      • Westerwald
        • Wied Iron Spar District
          • Neuwied
            • Puderbach
    		Lapis, 9 (9), 31-38.
    Iran
     
    • East Azarbaijan Province
      • Takab (Takan Tepe)
    		Daliran, F. (2008): The carbonate rock-hosted epithermal gold deposit of Agdarreh, Takab geothermal field, NW Iran—hydrothermal alteration and mineralisation. Mineralium Deposita, 43, 383-404
    Italy
     
    • Sardinia
      • Carbonia-Iglesias Province
        • Fluminimaggiore
    		Stara, P., Rizzo, R., Tanca, G.A. (1996): Iglesiente e Arburese. Miniere e Minerali. Edito a cura dell'EMSA e "varie associazioni mineralogiche", Volume 2°, 192 pp.
      • Medio Campidano Province
        • Gonnosfanadiga
          • Fenugu Sibiri Mine
    		Brizzi, G., Olmi, F., Sabelli, C. (1994): Gli arseniati di Pira Inferida, Gonnofanadiga (CA). Rivista Mineralogica Italiana, 3/1994, 193-206.
    Stara, P., Rizzo, R., Tanca, G.A. (1996): Iglesiente e Arburese. Miniere e Minerali. Edito a cura dell'EMSA e "varie associazioni mineralogiche", Volume 2°, 239 pp.
    Kazakhstan
     
    • Zhezqazghan Oblysy (Dzezkazgan Oblast'; Dzhezkazgan Oblast'; Djezkazgan Oblast'; Jezkazgan Oblast')
      • Balqash (Balkhash; Karatas) Region
        • Chu-Ili Mts
          • Alakol' Lake
    		Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1990) Handbook of Mineralogy.
    Mexico
     
    • Sonora
      • Mun. de Alamos
        • San Bernardo
    		[var: Cobaltian Mansfieldite] Panczner (1987): 166-364.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
            • Aghbar
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Aït Ahmane
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Méchoui
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Oumlil
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Spain
     
    • Murcia
      • Mazarrón-Águilas
        • Pastrana
    		Jordi Fabre
    MinRec-2003-0708-315
    UK
     
    • England
      • Cornwall
        • Mount's Bay District
          • St Hilary
    		No reference listed
    USA
     
    • Nevada
      • Elko Co.
        • Carlin District
    		NBMG Spec. Pub. 31 Minerals of Nevada
      • Eureka Co.
        • Lynn District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • Oregon
      • Lane Co.
        • Black Butte District
    		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: 766.
    • Washington
      • Yakima Co.
        • Bumping Lake District
          • Bumping Lake
    		Cannon, B. (1975): Minerals of Washington, p.118, 154
    Mineral and/or Locality
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