Mineralogy Database

Lepidocrocite Mineral Data

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General Lepidocrocite Information

Help on Chemical  Formula: Chemical Formula: FeO(OH)
Help on Composition: Composition: Molecular Weight = 88.85 gm
   Iron      62.85 %  Fe   89.86 % Fe2O3
   Hydrogen   1.13 %  H    10.14 % H2O
   Oxygen    36.01 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+O(OH)
Help on Environment: Environment: Common in iron ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1813
Help on Locality: Locality: Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek lipis - "scale" and krokis - "fibre."
Help on Name Pronunciation: Name Pronunciation: Lepidocrocite + Pronunciation Say LEPIDOCROCITE
Help on Synonym: Synonym: Esmeraldaite
  Esmeraldite
  Hydrohematite
  ICSD 27846
  PDF Aug-98
 

Lepidocrocite Image

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  Lepidocrocite

Comments: Translucent, red-brown crystals of lepidocrocite lining cavities in gossan matrix.
Location: Eisenzecher Zug Mine, Eiserfeld, Siegen District, North Rhine-Westphalia, Germany. Scale: 7x5x3 cm.
© John Betts - Fine Minerals

Lepidocrocite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3087:1:0.2448
Help on Cell Dimensions: Cell Dimensions: a = 3.86, b = 12.5, c = 3.06, Z = 4; V = 147.65 Den(Calc)= 4.00
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Amam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.26(1), 3.29(0.9), 2.47(0.8),
Help on Forms: Forms:

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Drag1 - Manipulate Crystal
Drag2 - Resize

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Help on Above

Forms: ( 0 3 1) ( 2 0 1) ( 0 1 0) ( 4 0 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Lepidocrocite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Red, Yellowish brown, Blackish brown.
Help on Density: Density: 4
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: dark yellow brown
 

Optical Properties of Lepidocrocite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3042,KPDmeas= 0.3042,KC= 0.3175
Ncalc = 2.27
Help on Optical Data: Optical Data: Biaxial (+), a=1.94, b=2.2, g=2.51, bire=0.5700, 2V(Calc)=84, 2V(Meas)=83. Dispersion relatively weak.
Help on Pleochroism (x): Pleochroism (x): colorless or yellow.
Help on Pleochroism (y): Pleochroism (y): orange or dark red orange.
Help on Pleochroism (z): Pleochroism (z): orange or darker red orange.
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Bireflectance: RL Bireflectance: Strong.
Help on RL Color: RL Color: Light gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lepidocrocite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   13.00   21.40 
   
 420 nm   12.70   20.30 
 440 nm   12.40   19.20 
 460 nm   12.00   18.60 
 480 nm   11.70   18.10 
 500 nm   11.40   17.80 
 520 nm   11.20   17.40 
 540 nm   11.00   17.00 
 560 nm   10.80   16.50 
 580 nm   10.70   16.00 
 600 nm   10.60   15.70 
 620 nm   10.50   15.40 
 640 nm   10.40   15.20 
 660 nm   10.40   15.10 
 680 nm   10.40   15.00 
 700 nm   10.40   14.90 
Calculated Relative Intensity Colors of Lepidocrocite in Air
Relative
Intensity
   0%   90% 100% 180% 270% 360% 450% 540% 630% 720% 810% 820%
R1                        
R2                        
 

Calculated Properties of Lepidocrocite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.87 gm/cc
note: Specific Gravity of Lepidocrocite =4.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELepidocrocite = 18.93 barns/electron
U=PELepidocrocite x rElectron Density= 73.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lepidocrocite is Not Radioactive
 

Lepidocrocite Classification

Help on  Dana Class: Dana Class: 06.01.02.02 (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.02)Boehmite Group
 
06.01.02.01 Boehmite AlO(OH) Amam 2/m 2/m 2/m
 
06.01.02.02 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m
 
06.01.02.03 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.FE.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
 
04.FE.15 Boehmite AlO(OH) Amam 2/m 2/m 2/m
 
04.FE.15 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m
 

Other Lepidocrocite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Lepidocrocite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Lepidocrocite

FeO(OH)
Dana No: 06.01.02.02 Strunz No: 04.FE.15
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