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Walentaite

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About WalentaiteHide

Formula:
Fe3+3(P0.84As0.16O4)2(O,OH)6As3+2.56Ca0.42Na0.28Mn2+0.35Fe2+0.30O6.1(OH)0.9(H2O)0.9
possibly simplified as (Ca,Mn,Fe,Na)1.35Fe3+3[(P,As)O4]2As3+(O,OH)6; formerly given as H(Ca,Mn2+,Fe2+)Fe3+3(AsO4,PO4)4.7H2O
Colour:
Bright yellow
Lustre:
Vitreous
Hardness:
3
Crystal System:
Orthorhombic
Name:
Named in honor of Dr. Kurt Walenta (1 December 1927 Prague, Czech Republic - ), 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.
Unique combination of elements. One of 3 known minerals with arsenate and phosphate anions occupying separate structural positions (compare machatschkiite and epifanovite).

Compare natrowalentaite.

Walentaite has been redefined and shown to have 89% of its As as As(III) and not As(V). Ca, Na, Mn, and Fe(II) atoms are located in the interlayer space.
Its structure has trimeric As3+3O6 units.

Structurally related to alcantarillaite.


Classification of WalentaiteHide

Approved
Approval Year:
1983
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
40.5.10.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
20.9.17

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

Physical Properties of WalentaiteHide

Vitreous
Colour:
Bright yellow
Hardness:

Optical Data of WalentaiteHide

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

Chemical Properties of WalentaiteHide

Formula:
Fe3+3(P0.84As0.16O4)2(O,OH)6As3+2.56Ca0.42Na0.28Mn2+0.35Fe2+0.30O6.1(OH)0.9(H2O)0.9

possibly simplified as (Ca,Mn,Fe,Na)1.35Fe3+3[(P,As)O4]2As3+(O,OH)6; formerly given as H(Ca,Mn2+,Fe2+)Fe3+3(AsO4,PO4)4.7H2O
IMA Formula:
H2Ca2Fe3+6(AsO4)5(PO4)3 · 14H2O

Crystallography of WalentaiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Imma
Setting:
Imma
Cell Parameters:
a = 26.188(5) Å, b = 7.360(2) Å, c = 10.367(2) Å
Ratio:
a:b:c = 3.558 : 1 : 1.409
Unit Cell V:
1,998.17 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020839WalentaiteGrey I E, Mumme W G, Hochleitner R (2019) Trimeric As3+3O6 clusters in walentaite: crystal structure and revised formula European Journal of Mineralogy 31 111-1162019White Elephant mine, Pringle, South Dakota, USA0293
CIF Raw Data - click here to close

Type Occurrence of WalentaiteHide

Synonyms of WalentaiteHide

Other Language Names for WalentaiteHide

German:Walentait
Spanish:Walentaita

Relationship of Walentaite to other SpeciesHide

Other Members of this group:
Natrowalentaite [Fe3+0.5Na0.5(H2O)6][NaAs3+2(Fe3+2.33W6+0.67)(PO4)2O7]Orth. mmm (2/m 2/m 2/m) : Imma

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Walentaite associated with PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2O
1 photo of Walentaite associated with KaribibiteFe3+3(As3+O2)4(As3+2O5)(OH)
1 photo of Walentaite associated with ScoroditeFe3+AsO4 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

8.CH.10AnapaiteCa2Fe2+(PO4)2 · 4H2OTric. 1 : P1
8.CH.15PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2OTric. 1 : P1
8.CH.20Dittmarite(NH4)Mg(PO4) · H2OOrth.
8.CH.20Niahite(NH4)(Mn2+,Mg)(PO4) · H2OOrth. mm2 : Pmn21
8.CH.25FrancoanelliteK3Al5(PO3OH)6(PO4)2 · 12H2OTrig.
8.CH.25Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2OTrig. 3m (3 2/m) : R3c
8.CH.30Schertelite(NH4)2MgH2(PO4)2 · 4H2OOrth.
8.CH.35Hannayite(NH4)2Mg3H4(PO4)4 · 8H2OTric. 1 : P1
8.CH.40Struvite(NH4)Mg(PO4) · 6H2OOrth. mm2
8.CH.40Struvite-(K)KMg(PO4)·6H2OOrth. mm2 : Pmn21
8.CH.40HazeniteKNaMg2(PO4)2 · 14H2OOrth. mm2
8.CH.45Rimkorolgite(Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2OOrth.
8.CH.50BakhchisaraitseviteNa2Mg5(PO4)4 · 7H2OMon.
8.CH.55FahleiteCaZn5Fe3+2(AsO4)6 · 14H2OOrth.
8.CH.55SmolyaninoviteCo3Fe3+2(AsO4)4 · 11H2OOrth.
8.CH.60Barahonaite-(Al)(Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2OMon. 2/m : P2/b
8.CH.60Barahonaite-(Fe)(Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2OMon. 2/m : P2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.9.1AngelelliteFe3+4(AsO4)2O3Tric. 1 : P1
20.9.2ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
20.9.3KaňkiteFeAsO4 · 3.5H2OMon. 2 : P2
20.9.4FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
20.9.5KaatialaiteFe(H2AsO4)3 · 5H2OMon. 2/m
20.9.6SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
20.9.7ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.9.8Natropharmacosiderite(Na,K)Fe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.9PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.10KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
20.9.11ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
20.9.12YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
20.9.13DussertiteBaFe3+3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.9.14Liskeardite[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2OOrth.
20.9.15MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
20.9.16OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm

Other InformationHide

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

References for WalentaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Grey, I.E., Mumme, W.G., Hochleitner, R. (2019): Trimeric As3+3O6 clusters in walentaite: Crystal structure and revised formula. European Journal of Mineralogy: 31: 111-116.

Internet Links for WalentaiteHide

Localities for WalentaiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Western Australia
    • Lake Grace Shire
Nickel, E.H. (1987) Tungsten-bearing walentaite from Griffins Find gold deposit, Western Australia. Australian Mineralogist (1987): 2: 9-12.
Morocco
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Oumlil
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
Spain
 
  • Castile and Leon
    • Salamanca
      • Navasfrías
http://www.foro-minerales.com/forum/viewtopic.php?p=85470#85470
USA
 
  • Maine
    • Oxford County
      • Paris
  • Nevada
    • Mineral Co.
      • Fitting Mining District
        • Luning
          • Rhyolite Pass
Marco Ciriotti collection (analysed by SEM-EDS, 2005)
  • South Dakota
    • Custer Co.
      • Custer Mining 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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