Bamfordite Mineral Data

Bamfordite Mineral Data +

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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:

After its locality.

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:

TriclinicSpace 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),

Crystal Structure:

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Birch W D , Pring A , McBriar E M , Gatehouse B M , McCammon C A , American Mineralogist , 83 (1998) p.172-177, Bamfordite, a new hydrated iron molybdenum oxyhydroxide from Queensland,, Australia: Description and crystal chemistry

Physical Properties of Bamfordite

Cleavage:

[100] Fair

Color:

Green, Yellowish green.

Density:

3.62

Diaphaniety:

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= -0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2793,KPDmeas= 0.2808,KC= 0.2633

Optical Data:

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

Calculated Properties of Bamfordite

Electron Density:

r_electron=3.44 gm/cc
note: r_Bamfordite=3.64 gm/cc.

Fermion Index

Fermion Index = 0.12145
Boson Index = 0.87855

Photoelectric:

PE_Bamfordite= 79.46 barns/electron
U=PE_Bamfordite x r_electron= 273.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bamfordite is Not Radioactive

Bamfordite Classification

Dana Class:

49.3.7.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.3)(Hydrated, containing Hydroxyl or Halogen)

(49.3.7)Dana Group

49.3.7.1 Bamfordite ! FeMo2O6(OH)3·(H2O) P1 or P1 Tri

Strunz Class:

IV/E.03-40 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.03 - Molybdite - Ilsemannite series

IV/E.03-10 Molybdite MoO3 Pbnm 2/m 2/m 2/m

IV/E.03-20 Sidwillite MoO3·2(H2O) P 2₁/n 2/m

IV/E.03-30 Ilsemannite Mo3O8·n(H2O)(?) None

IV/E.03-40 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 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

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Bamfordite

Fe+++Mo2O6(OH)3·(H2O)
Dana No: 49.3.7.1 Strunz No: IV/E.03-40
Locality:

Notes: