Phyllotungstite (original) (raw)

A valid IMA mineral species

About PhyllotungstiteHide

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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.

Specific Gravity:

5.26 (Calculated)

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 (Cmcm, with a = 7.298(1), b = 12.640(2), c = 19.582(4) Å) was reported by Grey et al. (2013).

Compare also ferritungstite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3203:8

d1804d07-24fe-41ec-abed-560dc3e18614

IMA Classification of PhyllotungstiteHide

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IMA Formula:

HCaFe3+3(WO4)6 · 10H2O

Classification of PhyllotungstiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Pronunciation of PhyllotungstiteHide

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Pronunciation:

Physical Properties of PhyllotungstiteHide

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Fracture:

Irregular/Uneven

Density:

5.26 g/cm3 (Calculated)

Optical Data of PhyllotungstiteHide

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RI values:

_n_α = 2.100 _n_β = 2.183 - 2.185 _n_γ = 2.185

δ = 0.085

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of PhyllotungstiteHide

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Mindat 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.

Crystallography of PhyllotungstiteHide

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Class (H-M):

6/m m m _(_6/_m_2/_m_2/m ) - Dihexagonal Dipyramidal

Cell Parameters:

a = 7.31(3) Å, c = 19.55(1) Å

Unit Cell V:

904.72 ų (Calculated from Unit Cell)

Twinning:

On {110} (original orthorhomic description).

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?).

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of PhyllotungstiteHide

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General Appearance of Type Material:

Crusts, composed of tabular crystals and scaly, in part radial, aggregates. Crystals are up to 0.25 mm in size.

Place of Conservation of Type Material:

University of Stuttgart, Stuttgart, Germany.
National Museum of Natural History, Washington, D.C., USA, number 161199.

Geological Setting of Type Material:

Secondary mineral from the oxidized zone of a hydrothermal polymetallic deposit.

Associated Minerals at Type Locality:

Synonyms of PhyllotungstiteHide

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Other Language Names for PhyllotungstiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

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

Internet Links for PhyllotungstiteHide

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References for PhyllotungstiteHide

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Reference List:

Hawthorne, F.C., Dunn, P.J., Grice, J.D., Puziewicz, J., Shigley, J.E. (1986) New mineral names. American Mineralogist 71, 845-847 (846).

Birch, W. D., Grey, I. E., Mills, S. J., Bougerol, C., Pring, A., Ansermet, S. (2007) Pittongite, a new tungstate with a mixed-layer, pyrochlore hexagonal tungsten bronze structure, from Victoria, Australia. The Canadian Mineralogist, 45 (4) 857-864 doi:10.2113/gscanmin.45.4.857

Localities for PhyllotungstiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.