Mineralogy Database

Phyllotungstite Mineral Data

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General Phyllotungstite Information

Help on Chemical  Formula: Chemical Formula: CaFe+++3H(WO4)6•10(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CaFe3+3H(WO4)6•10(H2O)
Help on Environment: Environment: Secondary tungsen mineral.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Clara mine, Oberwolfach, Schwarzwald, Baden-Wurttenberg, Germay. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the crystal habit and composition.
Help on Name Pronunciation: Name Pronunciation: Phyllotungstite + Pronunciation Say PHYLLOTUNGSTITE

Phyllotungstite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.579:1:1.5528
Help on Cell Dimensions: Cell Dimensions: a = 7.29, b = 12.59, c = 19.55, Z = 3; V = 1,794.32 Den(Calc)= 5.21
Help on Crystal System: Crystal System: Orthorhombic Space Group: P 222,Pmm2,P mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.13(1), 1.822(0.8), 3.25(0.8),

Physical Properties of Phyllotungstite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Yellow.
Help on Density: Density: 5.26
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: yellowish

Optical Properties of Phyllotungstite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.68 gm/cc
note: Specific Gravity of Phyllotungstite =5.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEPhyllotungstite = 715.97 barns/electron
U=PEPhyllotungstite x rElectron Density=3,352.72 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Phyllotungstite is Not Radioactive

Phyllotungstite Classification

Help on  Dana Class: Dana Class: (49)Basic and Hydrated Molybdates and Tungstates
  (49.02.04)Dana Group Phyllotungstite CaFe3H(WO4)6•10(H2O) P 222,Pmm2,P mmm Ortho
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 07.GB.20





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