Mineralogy Database

Ferrimolybdite Mineral Data

Search Webmineral :

General Ferrimolybdite Information

Help on Chemical  Formula: Chemical Formula: Fe+++2(MoO4)3•8(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+2(MoO4)3•7(H2O)
Help on Environment: Environment: Molybdenite mines.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from its chemical composition.
Help on Name Pronunciation: Name Pronunciation: Ferrimolybdite Say FERRIMOLYBDITE
Help on Synonym: Synonym: Molybdite

Ferrimolybdite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Ferrimolybdite Crystallography

Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.4(1), 2.29(0.6), 3.33(0.5),

Physical Properties of Ferrimolybdite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: Yellow, Canary yellow, Sulfur yellow.
Help on Density: Density: 4 - 4.5, Average = 4.25
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Silky
Help on Streak: Streak: light yellow

Optical Properties of Ferrimolybdite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.289 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1937,KC= 0.2725
Ncalc = 2.09 - 2.23
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): clear yellow, clear yellow, or colorless.
Help on Pleochroism (y): Pleochroism (y): clear yellow, clear yellow, or colorless.
Help on Pleochroism (z): Pleochroism (z): dirty gray, canary yellow, or gray.

Calculated Properties of Ferrimolybdite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.07 gm/cc
note: Specific Gravity of Ferrimolybdite =4.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PEFerrimolybdite = 68.78 barns/electron
U=PEFerrimolybdite x rElectron Density= 280.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferrimolybdite is Not Radioactive

Ferrimolybdite Classification

Help on  Dana Class: Dana Class: (49)Basic and Hydrated Molybdates and Tungstates
  (49.02.01)Dana Group Ferrimolybdite Fe2(MoO4)3•8(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 07.GB.30 07 - SULFATES (SELENATES, TELLURATES)
  07.G - Molybdates, Wolframates and Niobates
  07.GB -With additional anions and/or H2O
07.GB.30 Ferrimolybdite Fe2(MoO4)3•8(H2O) Unk Ortho

Other Ferrimolybdite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Ford32)
Help on See Also: 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

Search for Ferrimolybdite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ferrimolybdite :

Ask about Ferrimolybdite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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


Dana No: Strunz No: 07.GB.30





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.