Ferrimolybdite Mineral Data

Ferrimolybdite Mineral Data +

[Mineral Forums] [Minerals for Sale] [About Us] [En Espanol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

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)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Ferrimolybdite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Ferrimolybdite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

The GeoZone

Wrights Rock Shop

Translate Ferrimolybdite Mineral Data :

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 :

Ferrimolybdite

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

Notes: