Mineralogy Database

Magnetite Mineral Data

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General Magnetite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++2O4
Help on Composition: Composition: Molecular Weight = 231.54 gm
   Iron    72.36 %  Fe   31.03 % FeO / 68.97 % Fe2O3
   Oxygen  27.64 %  O
          ______        ______ 
          100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+2Fe2+O4
Help on Environment: Environment: Common accessory mineral in igneous and metamorphic rocks. Can be biogenically produced by a wide variety of organisms.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Many localities and environments world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Magnes, a Geek shepherd, who discovered the mineral on Mt, Ida, He noted that the nails of his shoe and the iron ferrule of his staff clung to a rock.
Help on Name Pronunciation: Name Pronunciation: Magnetite + Pronunciation Say MAGNETITE
Help on Synonym: Synonym: ICSD 65339
  Lodestone
  Magnetic iron ore
  PDF 19-629
 

Magnetite Image

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  Magnetite

Comments: Black, opaque octahedral crystals of magnetite on matrix.
Location: Isle of Ischia, near Naples, Compania, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Nordenskioldine   Magnetite

Comments: Colorless to white bladed crystals of nordenskiöldine with black magnetite.
Location: Pöhla-Tellerhäuser Gallery, Pöhla, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

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  Chesterite   Magnetite

Comments: Green platy chesterite in black, metallic magnetite.
Location: Near Missoula, Missoula County, Montana, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnetite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.391, Z = 8; V = 590.80 Den(Calc)= 5.21
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.53(1), 1.483(0.85), 1.614(0.85),
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Physical Properties of Magnetite

Help on Cleavage: Cleavage: None
Help on Color: Color: Grayish black, Iron black.
Help on Density: Density: 5.1 - 5.2, Average = 5.15
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Naturally strong
Help on Streak: Streak: black
 

Optical Properties of Magnetite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2726,KPDmeas= 0.2757,KC= 0.2756
Ncalc = 2.41 - 2.44
Help on Optical Data: Optical Data: Isotropic, n=2.42.
Help on RL Color: RL Color: Gray with brownish tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Magnetite in Air
λ R  ∑ R(λ) 
 400 nm   22.30   
 420 nm   21.80 
 440 nm   21.30 
 460 nm   20.80 
 480 nm   20.50 
 500 nm   20.30 
 520 nm   20.30 
 540 nm   20.40 
 560 nm   20.50 
 580 nm   20.60 
 600 nm   20.60 
 620 nm   20.70 
 640 nm   20.80 
 660 nm   20.90 
 680 nm   21.00 
 700 nm   21.20 
Calculated Relative Intensity Colors of Magnetite in Air
Relative
Intensity
   0%   50% 100% 150% 200% 250% 300% 350% 400% 430%
R                    
 

Calculated Properties of Magnetite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.89 gm/cc
note: Specific Gravity of Magnetite =5.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMagnetite = 22.14 barns/electron
U=PEMagnetite x rElectron Density= 108.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnetite is Not Radioactive
 

Magnetite Classification

Help on  Dana Class: Dana Class: 07.02.02.03 (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.02)(Iron subgroup)
 
07.02.02.01 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m
 
07.02.02.02 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
07.02.02.03 Magnetite FeFe2O4 F d3m 4/m 3 2/m
 
07.02.02.04 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
07.02.02.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m
 
07.02.02.06 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m
 
07.02.02.07 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.BB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.B - Metal:Oxygen = 3:4 and similar
  04.BB -With only medium-sized cations
 
04.BB.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m
 
04.BB.05 Magnetite FeFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Gahnite ZnAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Chromite FeCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m
 
04.BB.05 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Coulsonite FeV2O4 F d3m 4/m 3 2/m
 
04.BB.05 Hercynite FeAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m
 
04.BB.05 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m
 
04.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m
 
04.BB.05 Spinel MgAl2O4 F d3m 4/m 3 2/m
 
04.BB.05 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m
 
04.BB.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m
 
04.BB.05 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m
 

Other Magnetite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Magnetite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - Franklin Minerals(Palache)
10 - GeoScienceWorld
11 - Glendale Community College
12 - Google Images
13 - Google Scholar
14 - Handbook of Mineralogy (MinSocAm)
15 - HyperPhysics
16 - MinDAT
17 - Mineral and Gemstone Kingdom
18 - Mineralienatlas (Deutsch)
19 - Online Mineral Museum
20 - QUT Mineral Atlas
21 - Ruff.Info
22 - Scandinavian mineral gallery
23 - UCLA - Petrography Thin-Sections
24 - University of Colorado - Mineral Structure Data
25 - WWW-MINCRYST
26 - theimage

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

Magnetite

Fe++Fe+++2O4
Dana No: 07.02.02.03 Strunz No: 04.BB.05
Locality:

 

Notes:

 

 
   
 


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