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Ferrimolybdite Mineral Data
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General Ferrimolybdite Information
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 Chemical Formula: |
Fe+++2(MoO4)3•8(H2O) |
| Composition: |
Molecular Weight = 717.61 gm |
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Iron 15.56 % Fe 22.25 % Fe2O3 |
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Molybdenum 40.11 % Mo 60.17 % MoO3 |
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Hydrogen 1.97 % H 17.57 % H2O |
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Oxygen 42.36 % O |
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______ ______ |
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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. |
| Name Pronunciation: |
Ferrimolybdite  |
| Synonym: |
Molybdite |
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Ferrimolybdite Image |
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Images:
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Ferrimolybdite
Comments: Greenish-yellow crystalline aggregates of ferrimolybdite on a gossanous matrix.
Location: Quarry No 2, Königshain, Oberlausitz, Saxony, Germany.
Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag |
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Ferrimolybdite Crystallography
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| Crystal System: |
Orthorhombic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 7.4(1), 2.29(0.6), 3.33(0.5), |
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Physical Properties of Ferrimolybdite
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| 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 |
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Optical Properties of Ferrimolybdite
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| Gladstone-Dale: |
CI meas= 0.289 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1937,KC= 0.2725
Ncalc = 2.09 - 2.23 |
| 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. |
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Calculated Properties of Ferrimolybdite
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| Electron Density: |
Bulk Density (Electron Density)=4.07 gm/cc
note: Specific Gravity of Ferrimolybdite =4.25 gm/cc.
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| Fermion Index: |
Fermion Index = 0.1
Boson Index = 0.9 |
| Photoelectric: |
PEFerrimolybdite = 68.78 barns/electron
U=PEFerrimolybdite x rElectron Density= 280.25 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferrimolybdite is Not Radioactive |
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Ferrimolybdite Classification
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| Dana Class: |
49.02.01.01 (49)Basic and Hydrated Molybdates and Tungstates |
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(49.02)(Hydrated) |
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(49.02.01)Dana Group |
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49.02.01.01 Ferrimolybdite Fe2(MoO4)3•8(H2O) Unk Ortho |
| Strunz Class: |
07.GB.30 07 - SULFATES (SELENATES, TELLURATES) |
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07.G - Molybdates, Wolframates and Niobates |
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07.GB -With additional anions and/or H2O |
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07.GB.30 Ferrimolybdite Fe2(MoO4)3•8(H2O) Unk Ortho |
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Other Ferrimolybdite Information
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Ford32) |
| See Also: |
Links to other databases for Ferrimolybdite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Ferrimolybdite Specimen Label here :
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Ferrimolybdite
Fe+++2(MoO4)3•8(H2O)
Dana No: 49.02.01.01 Strunz No: 07.GB.30
Locality:
Notes:
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