Phyllotungstite Mineral Data

General Phyllotungstite Information

Chemical Formula:

CaFe+++3H(WO4)6•10(H2O)

Composition:

Molecular Weight = 1,875.87 gm

Calcium 2.14 % Ca 2.99 % CaO

Iron 8.93 % Fe 12.77 % Fe₂O₃

Hydrogen 1.13 % H 10.08 % H₂O

Tungsten 58.80 % W 74.16 % WO₃

Oxygen 29.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe³⁺₃H(WO₄)₆•10(H₂O)

Environment:

Secondary tungsen mineral.

IMA Status:

Approved IMA 1984

Locality:

Clara mine, Oberwolfach, Schwarzwald, Baden-Wurttenberg, Germay. Link to MinDat.org Location Data.

Name Origin:

Named for the crystal habit and composition.

Name Pronunciation:

Phyllotungstite + Pronunciation

Phyllotungstite Crystallography

Axial Ratios:

a:b:c =0.579:1:1.5528

Cell Dimensions:

a = 7.29, b = 12.59, c = 19.55, Z = 3; V = 1,794.32 Den(Calc)= 5.21

Crystal System:

Orthorhombic Space Group: P 222,Pmm2,P mmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.13(1), 1.822(0.8), 3.25(0.8),

Physical Properties of Phyllotungstite

Cleavage:

{001} Perfect

Color:

Yellow.

Density:

5.26

Diaphaneity:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Scaly - Morphology like fish scales.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luster:

Pearly

Streak:

yellowish

Optical Properties of Phyllotungstite

Gladstone-Dale:

CI meas= -0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2219,KPDmeas= 0.2198,KC= 0.2076
Ncalc = 2.08 - 2.09

Optical Data:

Biaxial (-), a=2.1, b=2.183-2.185, g=2.185, bire=0.0850, 2V(Calc)=0-16, 2V(Meas)=0-18.

Calculated Properties of Phyllotungstite

Electron Density:

Bulk Density (Electron Density)=4.68 gm/cc
note: Specific Gravity of Phyllotungstite =5.26 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_{Phyllotungstite}= 715.97 barns/electron
U=PE_{Phyllotungstite} x rElectron Density=3,352.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Phyllotungstite is Not Radioactive

Phyllotungstite Classification

Dana Class:

49.02.04.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.02)(Hydrated)

(49.02.04)Dana Group

49.02.04.01 Phyllotungstite CaFe3H(WO4)6•10(H2O) P 222,Pmm2,P mmm Ortho

Strunz Class:

07.GB.20 07 - SULFATES (SELENATES, TELLURATES)

07.G - Molybdates, Wolframates and Niobates

07.GB -With additional anions and/or H2O

07.GB.20 Phyllotungstite CaFe3H(WO4)6•10(H2O) P 222,Pmm2,P mmm Ortho

Other Phyllotungstite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Phyllotungstite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Phyllotungstite Specimen Label here :

Phyllotungstite

CaFe+++3H(WO4)6•10(H2O)
Dana No: 49.02.04.01 Strunz No: 07.GB.20
Locality:

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