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Phyllotungstite

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Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
© Stephan Wolfsried

Show Phyllotungstite Photos (3)
Formula:
Ca
 
x
[(W,Fe)(O,OH)
 
3
]·yH
 
2
O
System:HexagonalColour:Yellow
Hardness:2
Name:For the appearance (Greek phyllos) and the chemical composition (tungsten).


Structural and chemical similarities to Pittongite.

Formula revised by Grey et al. (2006).

Classification of Phyllotungstite

IMA status:Approved 1984
Strunz 8th edition ID:6/G.02-40
Nickel-Strunz 10th (pending) edition ID:7.GB.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
Dana 8th edition ID:49.2.4.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
2 : Hydrated Normal Molybdates and Tungstates
Hey's CIM Ref.:27.4.17

27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates
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Type Occurrence of Phyllotungstite

Type Locality:Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
Year of Discovery:1984

Physical Properties of Phyllotungstite

Lustre:Pearly
Diaphaneity (Transparency):Translucent
Colour:Yellow
Hardness (Mohs):2

Crystallography of Phyllotungstite

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P63/mmc (P63/m 2/m 2/c)
Cell Parameters:a = 7.31(3) Å, c = 19.55(1) Å
Ratio:a:c = 1 : 2.674
Unit Cell Volume: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?).

Optical Data of Phyllotungstite

Type:Biaxial (-)
RI values: nα = 2.100 nβ = 2.183 - 2.185 nγ = 2.185
Maximum Birefringence:δ = 0.085

Chart 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 Phyllotungstite

Formula:
Ca
 
x
[(W,Fe)(O,OH)
 
3
]·yH
 
2
O
Essential elements:Ca, Fe, H, O, W
All elements listed in formula:Ca, Fe, H, O, W

Relationship of Phyllotungstite to other Species

Related Minerals - Nickel-Strunz Grouping):
7.GB.05Lindgrenite
Cu
 
3
[OH|MoO
 
4
]
 
2
7.GB.10Szenicsite
Cu
 
3
(MoO
 
4
)(OH)
 
4
7.GB.15Cuprotungstite
Cu
 
2
[(OH)
 
2
|WO
 
4
]
7.GB.25Rankachite
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH)•(Ca
 
x
H
 
2
O
 
y
) with x ~ 0.5, y ~ 2.
7.GB.30Ferrimolybdite
Fe
 
2
[MoO
 
4
]
 
3
 · nH
 
2
O
7.GB.35Anthoinite
WAlO
 
3
(OH)
 
3
 (?)
7.GB.35Mpororoite
AlWO
 
3
(OH)
 
3
·2H
 
2
O
7.GB.40Obradovicite
H
 
4
(K,Na)CuFe
 
2
AsO
 
4
(MoO
 
4
)
 
5
·12H
 
2
O
7.GB.45Mendozavilite
Na(Ca,Mg)
 
2
[Fe
 
6
(PO
 
4
)
 
2
(PMo
 
11
O
 
39
)(OH,Cl)
 
10
]·33H
 
2
O
7.GB.45Paramendozavilite
NaAl
 
4
[Fe
 
7
(PO
 
4
)
 
5
(PMo
 
12
O
 
40
)(OH)
 
16
]·56H
 
2
O
Related Minerals - Hey's Index Grouping:
27.4.1Cuprotungstite
Cu
 
2
[(OH)
 
2
|WO
 
4
]
27.4.2Scheelite
Ca[WO
 
4
]
27.4.4Anthoinite
WAlO
 
3
(OH)
 
3
 (?)
27.4.5Mpororoite
AlWO
 
3
(OH)
 
3
·2H
 
2
O
27.4.6Yttrotungstite-(Y)
YW
 
2
O
 
6
(OH)
 
3
27.4.7Yttrotungstite-(Ce)
(Ce,Nd,Y)W
 
2
O
 
6
(OH)
 
3
27.4.8Stolzite
Pb[WO
 
4
]
27.4.9Raspite
PbWO
 
4
27.4.10Russellite
(BiO)
 
2
[WO
 
4
]
27.4.11Pinalite
Pb
 
3
WO
 
3
Cl
 
2
27.4.12Uranotungstite
(Fe
2+
 
,Ba,Pb)(UO
 
2
)
 
2
[(OH)
 
4
|WO
 
4
] · 12H
 
2
O
27.4.13Hübnerite
MnWO
 
4
27.4.14Ferberite
FeWO
 
4
27.4.15Wolframite
(Fe
2+
 
)WO
 
4
 
 
to (Mn
2+
 
)WO
 
4
27.4.16Ferritungstite
(W,Fe
3+
 
)(O,OH)
 
3
27.4.18Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10

Other Names for Phyllotungstite

Synonyms:
IMA1984-018
German names:
Phyllotungstit

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 Phyllotungstite

Reference List: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.

Internet Links for Phyllotungstite

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    Localities for Phyllotungstite

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    Germany
     
    • 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)
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