Ferrimolybdite Mineral Data

Ferrimolybdite Mineral Data +

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General Ferrimolybdite Information

Chemical Formula:

Fe+++2(MoO4)3·8(H2O)

Composition:

Molecular Weight = 717.61 gm

Iron 15.56 % Fe 22.25 % Fe₂O₃

Molybdenum 40.11 % Mo 60.17 % MoO₃

Hydrogen 1.97 % H 17.57 % H₂O

Oxygen 42.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂(MoO₄)₃·7(H₂O)

Environment:

Molybdenite mines.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named from its chemical composition.

Synonym:

Molybdite

Ferrimolybdite Image

Images:

Ferrimolybdite

Comments: Greenish-yellow crystalline aggregates of ferrimolybdite on a gossanous matrix.
Location: Quarry No 2, K?nigshain, Oberlausitz, Saxony, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Ferrimolybdite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 7.4(1), 2.29(0.6), 3.33(0.5),

Physical Properties of Ferrimolybdite

Cleavage:

[001] Distinct

Color:

Yellow, Canary yellow, Sulfur yellow.

Density:

4 - 4.5, Average = 4.25

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Scaly - Morphology like fish scales.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Silky

Streak:

light yellow

Optical Properties of Ferrimolybdite

Gladstone-Dale:

CI meas= 0.289 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1937,KC= 0.2725

Optical Data:

Biaxial (+), a=1.72-1.78, b=1.73-1.79, g=1.87-2.05, bire=0.1500-0.2700, 2V(Calc)=26-32, 2V(Meas)=5-28. Dispersion r < v marked.

Pleochroism (x):

clear yellow, clear yellow, or colorless.

Pleochroism (y):

clear yellow, clear yellow, or colorless.

Pleochroism (z):

dirty gray, canary yellow, or gray.

Calculated Properties of Ferrimolybdite

Electron Density:

r_electron=4.07 gm/cc
note: r_{Ferrimolybdite}=4.25 gm/cc.

Fermion Index

Fermion Index = 0.10566
Boson Index = 0.89434

Photoelectric:

PE_{Ferrimolybdite}= 68.78 barns/electron
U=PE_{Ferrimolybdite} x r_electron= 280.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrimolybdite is Not Radioactive

Ferrimolybdite Classification

Dana Class:

49.2.1.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.2)(Hydrated)

(49.2.1)Dana Group

49.2.1.1 Ferrimolybdite Fe2(MoO4)3·8(H2O) Unk Ortho

Strunz Class:

VI/G.02-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/G - Molybdates [MoO4]2- and wolframates [WO4]2-

VI/G.02 - Lindgrenite - Phyllotungstite series

VI/G.02-05 Biehlite! (Sb,As)2MoO6 C 2/c 2/m

VI/G.02-10 Lindgrenite Cu3(MoO4)2(OH)2 P 2₁/n 2/m

VI/G.02-15 Szenicsite Cu3MoO4(OH)4 Pnnm, Pnn2 Ortho

VI/G.02-20 Cuprotungstite Cu3(WO4)2(OH)2 Unk Tetra

VI/G.02-25 Vergasovaite! Cu3O[(Mo,S)O4][SO4] P nma 2/m 2/m 2/m

VI/G.02-30 Ferrimolybdite Fe2(MoO4)3·8(H2O) Unk Ortho

VI/G.02-40 Phyllotungstite CaFe3H(WO4)6·10(H2O) P 222,Pmm2,P mmm Ortho

Other Ferrimolybdite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Ford32)

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Print or Cut-and-Paste your Ferrimolybdite Specimen Label here :

Ferrimolybdite

Fe+++2(MoO4)3·8(H2O)
Dana No: 49.2.1.1 Strunz No: VI/G.02-30
Locality:

Notes: