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Phyllotungstite

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About PhyllotungstiteHide

Formula:
(H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K)
Based on the assumption that H2O fills up 10 A sites.
Colour:
Yellow
Lustre:
Pearly
Hardness:
2
Crystal System:
Hexagonal
Name:
For the appearance (Greek phyllos) and the chemical composition (tungsten).
Structurally and chemically similar to Pittongite.
Orthorhombic-pseudohexagonal.

Originally proposed formula is HCaFe3+3(WO4)6.10H2O (Walenta, 1984). Formula revised by Grey et al. (2006).

Note: Pb-, K- and Cs-dominant members have been described by Walenta (2008) and Walenta & Theye (2010a,b). The K-member is pseudohexagonal and forms aragonite-like drillings. Re-analysis of phyllotungstite type material showed that Cs and Pb are also present, in variable amounts (Walenta, 2008).
The orthorhombic-pseudohexagonal crystal structure of a Pb-bearing phyllotungstite was reported by Grey et al. (2013).

Compare also ferritungstite.


Classification of PhyllotungstiteHide

Approved
Approval Year:
1984
7.GB.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
49.2.4.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
2 : Hydrated Normal Molybdates and Tungstates
27.4.17

27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates

Pronounciation of PhyllotungstiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of PhyllotungstiteHide

Pearly
Transparency:
Translucent
Colour:
Yellow
Hardness:

Optical Data of PhyllotungstiteHide

Type:
Biaxial (-)
RI values:
nα = 2.100 nβ = 2.183 - 2.185 nγ = 2.185
Max Birefringence:
δ = 0.085
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v extreme

Chemical Properties of PhyllotungstiteHide

Formula:
(H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K)

Based on the assumption that H2O fills up 10 A sites.
IMA Formula:
HCaFe3+3(WO4)6 · 10H2O

Crystallography of PhyllotungstiteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 7.31(3) Å, c = 19.55(1) Å
Ratio:
a:c = 1 : 2.674
Unit Cell V:
904.72 ų (Calculated from Unit Cell)
Morphology:
Platy.
Comment:
Originally given cell was orthorhombic, with 7.29, 12.59 and 19.55. Since the mineral is optically biaxial, the space group given by Grey (2006) might refer to an average cell (due to twinning?).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.33 (7)
6.01 (6)
3.25 (8)
3.13 (10)
2.92 (7)
2.45 (7)
1.822 (8)

Type Occurrence of PhyllotungstiteHide

Synonyms of PhyllotungstiteHide

Other Language Names for PhyllotungstiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.GB.05LindgreniteCu3(MoO4)2(OH)2Mon. 2/m : P21/m
7.GB.10SzenicsiteCu3(MoO4)(OH)4Orth.
7.GB.15CuprotungstiteCu2(WO4)(OH)2Tet. 4 2 2 : P41 21 2
7.GB.15UM1999-38-WO:CrV(V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3]
7.GB.25RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
7.GB.30FerrimolybditeFe2(MoO4)3 · nH2OOrth. mmm (2/m 2/m 2/m) : Pmmn
7.GB.35AnthoiniteAlWO3(OH)3Tric. 1
7.GB.35MpororoiteWAlO3(OH)3 · 2(H2O)
7.GB.40Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
7.GB.45Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
7.GB.45ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2OMon.
7.GB.50Tancaite-(Ce)FeCe(MoO4)3·3H2O Trig. 3 : R3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

27.4.1CuprotungstiteCu2(WO4)(OH)2Tet. 4 2 2 : P41 21 2
27.4.2ScheeliteCa(WO4)Tet. 4/m : I41/a
27.4.4AnthoiniteAlWO3(OH)3Tric. 1
27.4.5MpororoiteWAlO3(OH)3 · 2(H2O)
27.4.6Yttrotungstite-(Y)YW2O6(OH)3
27.4.7Yttrotungstite-(Ce)(Ce,Nd,Y)W2O6(OH)3Mon. 2 : P21
27.4.8StolzitePb(WO4)Tet. 4/m : I41/a
27.4.9RaspitePb(WO4)Mon. 2/m : P21/b
27.4.10RusselliteBi2WO6Orth.
27.4.11PinalitePb3WO5Cl2Orth.
27.4.12Uranotungstite(Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2OOrth.
27.4.13HübneriteMnWO4Mon. 2/m : P2/b
27.4.14FerberiteFeWO4Mon. 2/m : P2/b
27.4.15Wolframite(Fe2+)WO4 to (Mn2+)WO4Mon. 2/m : P2/b
27.4.16FerritungstiteIso. m3m (4/m 3 2/m) : Fd3m
27.4.18Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10Orth.

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 PhyllotungstiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. (1984): Phyllotungstit, ein neues sekundäres Wolframmineral aus der Grube Clara im mittleren Schwarzwald. Neues Jahrb. Mineral., Monatsh. 1984, 529-535. (in German).
American Mineralogist (1986): 71: 846.
Grey, I.E., Birch, W.D., Bougerol, C., Mills, S.J. (2006): Unit-cell intergrowth of pyrochlore and hexagonal tungsten bronze structures in secondary tungsten minerals. Journal of Solid State Chemistry, 179, 3860-3869.
Birch, W.D., Grey, I.E., Mills, S.J., Bougerol, C., Pring, A., Ansermet, S. (2007): Pittongite, a new secondary tungstate from Pittong, Victoria, Australia. Canadian Mineralogist, 45, 857-864.
Walenta, K. (2008): Pittongit und Phyllotungstit. Erzgräber, 20, 103-107 (in German).
Walenta, K. & Theye, T. (2010a): Ein dem Phyllotungstit nahestehendes cäsiumreiches Mineral von der Grube Clara bei Oberwolfach im mittleren Schwarzwald. Erzgräber 24, 1-8.
Walenta, K. & Theye, T. (2010): Ein bleireiches und kaliumreiches Phyllotungstitmineral von der Grube Clara im mittleren Schwarzwald. Erzgräber 24, 66-76 (in German).
Grey, I. E., Mumme, W. G., MacRae, C. M. (2013): Lead-bearing phyllotungstite from the Clara mine, Germany with an ordered pyrochlore-hexagonal tungsten bronze intergrowth structure. Mineralogical Magazine 77, 57-67.

Internet Links for PhyllotungstiteHide

Localities for PhyllotungstiteHide

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.
Germany (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Neues Jahrb.Min.,Mh.(1984) 529-535; Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
Spain
 
  • Andalusia
    • Córdoba
      • Belalcázar
Rewitzer C., Hochleitner R., Fehr T., Utrera C., Karibibite, schneiderhöhnite, tooeleite and other uncommon secondary minerals in the Nuestra Señora de las Alcantarillas mine, Belalcázar, Córdoba, Spain; MineralUp (Revista de Minerales) No.1 Oct. 2016 Page 9-39
Mineral and/or Locality  
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