Bamfordite Mineral Data

General Bamfordite Information

Chemical Formula:

Fe+++Mo2O6(OH)3•(H2O)

Composition:

Molecular Weight = 412.76 gm

Iron 13.53 % Fe 19.34 % Fe₂O₃

Molybdenum 46.49 % Mo 69.74 % MoO₃

Hydrogen 1.22 % H 10.91 % H₂O

Oxygen 38.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺Mo₂O₆(OH)₃•(H₂O)

Environment:

In tungsten-molybdenum-bismuth deposits formed by the oxidation of molybdenite.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Found at the Bamford Hill W-Mo-Bi deposits, 85 km WSW of Cairns, northern Queensland, Australia, Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Bamfordite + Pronunciation

Synonym:

ICSD 77506

IMA1996-059

Molybdoferrite

PDF 50-1619

Bamfordite Image

Images:

Bamfordite

Comments: Scanning electron micrograph showing the typical morphology of bamfordite crystals. (AmMin, 83:173).
Location: Abandoned W-Mo-Bi mines at Bamford, Queensland, Australia. Scale: Scale Bar 20 µm.
© American Mineralogist

Bamfordite Crystallography

Axial Ratios:

a:b:c =0.7805:1:1.2483

Cell Dimensions:

a = 5.889, b = 7.545, c = 9.419, Z = 2; alpha = 71.46°, beta = 83.42°, gamma = 72.78° V = 376.51 Den(Calc)= 3.64

Crystal System:

Triclinic Space Group: P1 or P1

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

By Intensity(I/I_o): 3.319(1), 3.232(0.9), 5.62(0.7),

Physical Properties of Bamfordite

Cleavage:

{100} Fair

Color:

Green, Yellowish green.

Density:

3.62

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Adamantine

Streak:

greenish yellow

Optical Properties of Bamfordite

Gladstone-Dale:

CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2808,KPDmeas= 0.2808,KC= 0.2633
Ncalc = 1.95

Optical Data:

Biaxial (-), a=1.91, b=2.03, g=2.11, bire=0.2000

Calculated Properties of Bamfordite

Electron Density:

Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Bamfordite =3.62 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Bamfordite= 79.46 barns/electron
U=PE_Bamfordite x rElectron Density= 271.79 barns/cc.

Radioactivity:

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

Bamfordite Classification

Dana Class:

49.03.07.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.03)(Hydrated, containing Hydroxyl or Halogen)

(49.03.07)Dana Group

49.03.07.01 Bamfordite! FeMo2O6(OH)3•(H2O) P1 or P1 Tri

Strunz Class:

04.FK.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FK -Hydroxides with H2O ï¿½ (OH); chains of edge-sharing octahedra

04.FK.05 Bamfordite! FeMo2O6(OH)3•(H2O) P1 or P1 Tri

Other Bamfordite Information

References:

NAME( AmMin, Vol 83) PHYS. PROP.(Am.Min.,Vol.83,p172-177,1998) OPTIC PROP.(AmMin)

See Also:

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

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Bamfordite

Fe+++Mo2O6(OH)3•(H2O)
Dana No: 49.03.07.01 Strunz No: 04.FK.05
Locality:

Notes:

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