Ferberite Mineral Data

Ferberite Mineral Data +

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General Ferberite Information

Chemical Formula:

Fe++WO4

Composition:

Molecular Weight = 303.69 gm

Iron 18.39 % Fe 23.66 % FeO

Tungsten 60.54 % W 76.34 % WO₃

Oxygen 21.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺(WO₄)

Environment:

In high-temperature hydrothermal veins, greisens, and granitic pegmatites, also a residual mineral in alluvial and eluvial deposits.

IMA Status:

Valid Species (Pre-IMA) 1863

Locality:

Aquiles, Sierra Almagrera, Spain. Link to MinDat.org Location Data.

Name Origin:

Named after Moritz Rudolph Ferber (1805-1875) of Gera, Germany.

Synonym:

ICSD 64733

PDF 46-1446

Ferberite Image

Images:

Ferberite

Comments: Ferberite with minor siderite selvage.
Location: Panasqueira (2nd level), in the region of Beira Baixa, Portugal. Scale: 6 x 5 cm.
© Fabre Minerals

Images:

Ferberite Anthoinite Cerotungstite-(Ce)

Comments: Yellow cerotungstite-(Ce), with black ferberite veins and whitish anthoinite.
Location: Bugarama, Rwanda. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferberite Crystallography

Axial Ratios:

a:b:c =0.838:1:0.8661

Cell Dimensions:

a = 4.76, b = 5.68, c = 4.92, Z = 2; beta = 90.016° V = 133.02 Den(Calc)= 7.58

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/c

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

By Intensity(I/I_o): 2.941(1), 4.75(0.45), 3.752(0.35),

Forms:

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Forms: [ 1 0 2] [ 1 1 0] [ 1 0 0] [ 0 1 1]

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Crystal Structure:

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Ulku D , Zeitschrift fur Kristallographie , 124 (1967) p.192-219, Untersuchungen zur kristallstruktur und magnetischen struktur, des ferberits FeWO4

Physical Properties of Ferberite

Cleavage:

[010] Perfect, [100] Parting, [102] Parting

Color:

Black.

Density:

7.5 - 7.4, Average = 7.45

Diaphaniety:

Nearly opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Streak:

brownish black

Optical Properties of Ferberite

Gladstone-Dale:

CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1748,KPDmeas= 0.1778,KC= 0.175

Optical Data:

Biaxial (+), a=2.255, b=2.305, g=2.414, bire=0.1590, 2V(Calc)=72, 2V(Meas)=68.

Pleochroism (x):

dark brown.

Pleochroism (y):

dark brown.

Pleochroism (z):

dark brown.

RL Anisotrophism:

Distinct.

RL Bireflectance:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ferberite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	16.50	19.50
420 nm	16.40	19.20
440 nm	16.30	18.90
460 nm	16.20	18.70
480 nm	15.90	18.50
500 nm	16.00	18.70
520 nm	16.00	18.70
540 nm	16.00	18.70
560 nm	16.00	18.70
580 nm	15.80	18.60
600 nm	15.80	18.60
620 nm	15.70	18.60
640 nm	15.60	18.50
660 nm	15.50	18.30
680 nm	15.40	18.10
700 nm	15.50	18.00

**Calculated Relative Intensity Colors of Ferberite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	560%
R₁
R₂

Calculated Properties of Ferberite

Electron Density:

r_electron=6.59 gm/cc
note: r_Ferberite=7.58 gm/cc.

Fermion Index

Fermion Index = 0.09044
Boson Index = 0.90956

Photoelectric:

PE_Ferberite= 757.55 barns/electron
U=PE_Ferberite x r_electron=4,991.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferberite is Not Radioactive

Ferberite Classification

Dana Class:

48.1.1.2 (48)Anhydrous Molybdates and Tungstates

(48.1)where A XO4

(48.1.1)Wolframite series

48.1.1.0 Wolframite* (Fe,Mn)WO4 P 2/c 2/m

48.1.1.1 Hubnerite MnWO4 P 2/c 2/m

48.1.1.2 Ferberite FeWO4 P 2/c 2/m

48.1.1.3 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

Strunz Class:

IV/D.16-20 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.16 - Wolframite series

IV/D.16-10 Hubnerite MnWO4 P 2/c 2/m

IV/D.16-20 Ferberite FeWO4 P 2/c 2/m

IV/D.16-30 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

IV/D.16-40 Wolframoixiolite* (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

Other Ferberite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5, Enc. of Minerals, 2nd ed)

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Ferberite

Fe++WO4
Dana No: 48.1.1.2 Strunz No: IV/D.16-20
Locality:

Notes: