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Walentaite

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Oumlil Mine (incl. Oumlil East Mine), Oumlil, Bou Azer District (Bou Azzer District), Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco
© sergio varvello

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Formula:
H(Ca,Mn
2+
 
,Fe
2+
 
)Fe
3+
3
(AsO
 
4
,PO
 
4
)
 
4
 · 7H
 
2
O
System:OrthorhombicColour:Bright yellow
Hardness:3
Name:After Dr. Kurt Walenta (b. 1927), Professor of Mineralogy, University of Stuttgart (Germany), who made significant contributions to the mineralogy of arsenates and phosphates, especially from the Schwarzwald (Black Forest), Germany.
This page provides mineralogical data about Walentaite.

Classification of Walentaite

IMA status:Approved 1983
Strunz 8th edition ID:7/C.18-30
Nickel-Strunz 10th (pending) edition ID:8.CH.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
Dana 8th edition ID:40.5.10.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
Hey's CIM Ref.:20.9.17

20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe
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Type Occurrence of Walentaite

Type Locality:White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer Co., South Dakota, USA
Year of Discovery:1984
Geological Setting of type material:Complex zoned pegmatite
Associated Minerals at type locality:
TridymiteSpessartineRockbridgeiteQuartzMuscovite
Löllingite

Physical Properties of Walentaite

Lustre:Vitreous
Colour:Bright yellow
Hardness (Mohs):3

Crystallography of Walentaite

Crystal System:Orthorhombic
Cell Parameters:a = 26.24Å, b = 10.31Å, c = 7.38Å
Ratio:a:b:c = 2.545 : 1 : 0.716
Unit Cell Volume:V 1,996.54 ų (Calculated from Unit Cell)

Optical Data of Walentaite

Type:Biaxial (+)
Dispersion:r > v moderate

Chemical Properties of Walentaite

Formula:
H(Ca,Mn
2+
 
,Fe
2+
 
)Fe
3+
3
(AsO
 
4
,PO
 
4
)
 
4
 · 7H
 
2
O
Essential elements:As, Ca, Fe, H, O
All elements listed in formula:As, Ca, Fe, H, Mn, O, P

Relationship of Walentaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CH.10Anapaite
Ca
 
2
Fe
2+
 
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CH.15Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 11H
 
2
O
8.CH.20Dittmarite
(NH
 
4
)Mg(PO
 
4
) · H
 
2
O
8.CH.20Niahite
(NH
 
4
)(Mn
2+
 
,Mg)(PO
 
4
) · H
 
2
O
8.CH.25Francoanellite
K
 
3
Al
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
3
 · 12H
 
2
O
8.CH.25Taranakite
(K,NH
 
4
)Al
 
3
(PO
 
4
)
 
3
(OH) · 9H
 
2
O
8.CH.30Schertelite
(NH
 
4
)
 
2
MgH
 
2
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CH.35Hannayite
(NH
 
4
)
 
2
Mg
 
3
H
 
4
(PO
 
4
)
 
4
 · 8H
 
2
O
8.CH.40Struvite
(NH
 
4
)Mg(PO
 
4
) · 6H
 
2
O
8.CH.40Struvite-(K)
KMg(PO
 
4
)·6H
 
2
O
8.CH.40Hazenite
KNaMg
 
2
(PO
 
4
)
 
2
 · 14H
 
2
O
8.CH.45Rimkorolgite
(Mg,Mn)
 
5
(Ba,Sr,Ca)(PO
 
4
)
 
4
 · 8H
 
2
O
8.CH.50Bakhchisaraitsevite
Na
 
2
Mg
 
5
(PO
 
4
)
 
4
 · 7H
 
2
O
8.CH.55Fahleite
Zn
 
5
CaFe
 
2
(AsO
 
4
)
 
6
 · 14H
 
2
O
8.CH.55Smolyaninovite
8.CH.55Smolianinovite
(Co,Ni,Mg,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(AsO
 
4
)
 
4
 · 11H
 
2
O
8.CH.60Barahonaite-(Al)
(Ca,Cu,Na,Fe
3+
 
,Al)
 
12
Al
 
2
(AsO
 
4
)
 
8
(OH,Cl)
 
x
 · nH
 
2
O
8.CH.60Barahonaite-(Fe)
(Ca,Cu,Na,Fe
3+
 
,Al)
 
12
Fe
3+
2
(AsO
 
4
)
 
8
(OH,Cl)
 
x
 · nH
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.9.1Angelellite
Fe
3+
4
(AsO
 
4
)
 
2
O
 
3
20.9.2Scorodite
FeAsO
 
4
 · 2H
 
2
O
20.9.3Kaňkite
FeAsO
 
4
 · 3.5H
 
2
O
20.9.4Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
20.9.5Kaatialaite
Fe(H
 
2
AsO
 
4
)
 
3
 · 5H
 
2
O
20.9.6Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.9.7Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.9.8Natropharmacosiderite
(Na,K)Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
20.9.9Pharmacosiderite
KFe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
20.9.10Kolfanite
Ca
 
2
Fe
3+
2
(AsO
 
4
)
 
3
O
 
2
 · 2H
 
2
O
20.9.11Arseniosiderite
Ca
 
2
Fe
3+
3
(AsO
 
4
)
 
3
O
 
2
 · 3H
 
2
O
20.9.12Yukonite
Ca
 
3
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
20.9.13Dussertite
BaFe
3+
3
(AsO
 
4
)
 
2
(OH)
 
5
20.9.14Liskeardite
(Al,Fe
3+
 
)
 
3
(AsO
 
4
)(OH)
 
6
 · 5H
 
2
O
20.9.15Mapimite
Zn
 
2
Fe
3+
3
(AsO
 
4
)
 
3
(OH)
 
4
 · 10H
 
2
O
20.9.16Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)(AsO
 
4
)
 
4
(OH)
 
6
 · 6H
 
2
O

Other Names for Walentaite

Synonyms:
IMA1983-047
Other Languages:
German:Walentait
Spanish:Walentaita

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 Walentaite

Reference List:

- +
American Mineralogist (1984): 69: 1193-1194.

Dunn, P.J., D.R. Peacor, W.L. Roberts, T.J. Campbell, and R.A. Ramik (1984): Walentaite, a new calcium iron arsenate phosphate from the White Elephant mine, Pringle, South Dakota. Neues Jahrbuch für Mineralogie, Monatshefte, 1984: 169-174.

Nickel, E. H. (1987): Tungsten-bearing walentaite from Griffins Find gold deposit, Western Australia. Australian Mineralogist 2: 9-14.

Internet Links for Walentaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Walentaite details from Handbook of Mineralogy (PDF)
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    • Localities for Walentaite

    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.
    Australia
     
    • Western Australia
    		Nickel, E.H. (1987) Tungsten-bearing walentaite from Griffins Find gold deposit, Western Australia. Australian Mineralogist (1987): 2: 9-12.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azer District (Bou Azzer District)
            • Oumlil
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    USA
     
    • Maine
      • Oxford Co.
        • Paris
    • Nevada
      • Mineral Co.
        • Fitting District
          • Luning
            • Rhyolite Pass
    		Marco Ciriotti collection (analysed by SEM-EDS, 2005)
    • South Dakota
      • Custer Co.
        • Custer District
          • Pringle
            • Cicero Peak
    		Dunn, P.J., D.R. Peacor, W.L. Roberts, T.J. Campbell, and R.A. Ramik (1984)Walentaite, a new calcium iron arsenate phosphate from the White Elephant mine, Pringle, South Dakota. Neues Jahrbuch für Mineralogie, Monatshefte, 1984: 169-174.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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