Ferritungstite Mineral Data

Ferritungstite Mineral Data +

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General Ferritungstite Information

Chemical Formula:

(K,Ca,Na)(W++++++,Fe+++)2(O,OH)6·(H2O)

Composition:

Molecular Weight = 416.40 gm

Potassium 1.88 % K 2.26 % K₂O

Sodium 0.11 % Na 0.15 % Na₂O

Calcium 0.96 % Ca 1.35 % CaO

Iron 6.71 % Fe 8.63 % FeO

Hydrogen 0.68 % H 6.06 % H₂O

Tungsten 66.23 % W 83.52 % WO₃

Oxygen 23.44 % O

______ ______

100.00 % 101.96 % = TOTAL OXIDE

Empirical Formula:

K_0.2Ca_0.1Na_0.02W_1.5Fe²⁺_0.5O_4.7(H₂O)_1.4

Environment:

An alteration coating on and replacing primary tungsten minerals.

IMA Status:

Valid Species (Pre-IMA) 1911

Locality:

Germania tungsten mine, Deer Trail district, Fruitland, Stevens County, Washington, USA. Link to MinDat.org Location Data.

Name Origin:

Named for FERRIc iron and TUNGsten in its composition.

Synonym:

ICSD 79158

PDF 11-331

Ferritungstite Image

Images:

Ferritungstite

Comments: Small, yellow crystals of ferritungstite on matrix.
Location: Clara Mine, Oberwolfach, Wolfach Valley, Black Forest, Baden-W?rttemberg, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Ferritungstite Crystallography

Cell Dimensions:

a = 10.352, Z = 8; V = 1,109.36 Den(Calc)= 4.99

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 2.966(1), 5.94(1), 3.1(0.9),

Crystal Structure:

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Ercit T S , Robinson G W , The Canadian Mineralogist , 32 (1994) p.567-574, A refinement of the structure of ferritungstite from Kalzas mountain, Yukon, and, observations on the tungsten pyrochlores, Locality: Kalzas mountain, Yukon, Canada

Physical Properties of Ferritungstite

Color:

Yellow, Brownish yellow.

Density:

5.02 - 5.2, Average = 5.1

Diaphaniety:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Ferritungstite

Gladstone-Dale:

CI meas= -0.171 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.199 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2244,KPDmeas= 0.2192,KC= 0.1872

Optical Data:

Isotropic, n=2.09-2.15.

Calculated Properties of Ferritungstite

Electron Density:

r_electron=4.46 gm/cc
note: r_{Ferritungstite}=5.11 gm/cc.

Fermion Index

Fermion Index = 0.09612
Boson Index = 0.90388

Photoelectric:

PE_{Ferritungstite}= 821.78 barns/electron
U=PE_{Ferritungstite} x r_electron=3,663.15 barns/cc.

Radioactivity:

GRapi = 23.64 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Ferritungstite - barely detectable

Ferritungstite Classification

Dana Class:

4.5.5.1 (4)Simple Oxides

(4.5)with a cation charge of 6+ (A++++++ O3)

(4.5.5)Dana Group

4.5.5.1 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6·(H2O) F d3m 4/m 3 2/m

4.5.5.2 Elsmoreite! WO3·0.5(H2O) F d3m 4/m 3 2/m

Strunz Class:

IV/C.20-10 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.20 - Ferritungstite series

IV/C.20-10 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6·(H2O) F d3m 4/m 3 2/m

Other Ferritungstite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Ferritungstite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Ferritungstite

(K,Ca,Na)(W++++++,Fe+++)2(O,OH)6·(H2O)
Dana No: 4.5.5.1 Strunz No: IV/C.20-10
Locality:

Notes: