Goethite Mineral Data + Say GOETHITE

General Goethite Information
Help on Chemical Formula: Chemical Formula: Fe+++O(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) 1806
Help on Locality: Locality: Mesabi district, Minnesota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the German poet, J. W. Goethe (1749-1832).
Help on Synonym: Synonym: Acicular iron ore
  ICSD 28247
  Limonite
  Needle ironstone
  PDF 29-713
 

Goethite Image

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

Goethite

Comments: Stellate crystalline aggregates of acicular goethite crystals.
Location: Pribram, Bohemia, Czech Republic. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
Click Here for Larger Goethite Image in a New Browser Window Images:
Click Here for Larger Goethite Image

Goethite   Laubmannite

Comments: Reddish brown goethite hosting radiating sprays of olive green laubmannite to 3 cm across.
Location: Buckeye Mountain, Polk County, Arkansas, USA. Scale: 10.5 x 7.5 cm.
© John Veevaert

Goethite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4615:1:0.3034
Help on Cell Dimensions: Cell Dimensions: a = 4.596, b = 9.957, c = 3.021, Z = 4; V = 138.25 Den(Calc)= 4.27
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.18(1), 2.69(0.3), 2.452(0.25),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 0 1 0] [ 1 1 1] [ 1 0 0] [ 1 1 0] [ 0 1 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Goethite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Gualtieri A , Venturelli P , American Mineralogist , 84 (1999) p.895-904, In situ study of the goethite-hematite phase transformation by real time, synchrotron powder diffraction, Sample at T = 25 C

View Additional jPOWD Structure files for Goethite
[1] [2] [3] [4] [5] [6]
 

Physical Properties of Goethite

Help on Cleavage: Cleavage: [010] Perfect, [100] Distinct
Help on Color: Color: Brown, Reddish brown, Yellowish brown, Brownish yellow, Ocher yellow.
Help on Density: Density: 3.3 - 4.3, Average = 3.8
Help on Diaphaniety: Diaphaniety: Subtranslucent to opaque
Help on Fracture: Fracture: Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Adamantine - Silky
Help on Streak: Streak: yellowish brown
 

Optical Properties of Goethite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.14 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.322,KPDmeas= 0.3618,KC= 0.3175
Help on Optical Data: Optical Data: Biaxial (-), a=2.26-2.275, b=2.393-2.409, g=2.398-2.515, bire=0.1380-0.2400, 2V(Calc)=20-78, 2V(Meas)=0-27. Dispersion r > v extreme.
Help on Pleochroism (x): Pleochroism (x): yellow or colorless.
Help on Pleochroism (y): Pleochroism (y): brownish yellow or ocher yellow.
Help on Pleochroism (z): Pleochroism (z): orangish yellow or deep reddish orange.
Help on RL Anisotrophism: RL Anisotrophism: Distinct in bluish grays.
Help on RL Color: RL Color: Gray with bluish tint with yellow, red, brown internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Goethite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   17.50   19.20 
   
 420 nm   16.70   18.30 
 440 nm   15.90   17.40 
 460 nm   15.20   16.70 
 480 nm   14.60   16.00 
 500 nm   14.10   15.50 
 520 nm   13.70   15.00 
 540 nm   13.30   14.60 
 560 nm   13.00   14.30 
 580 nm   12.80   14.00 
 600 nm   12.50   13.70 
 620 nm   12.40   13.50 
 640 nm   12.20   13.40 
 660 nm   12.00   13.20 
 680 nm   12.00   13.10 
 700 nm   11.90   13.00 
Calculated Relative Intensity Colors of Goethite in Air
Relative
Intensity		    0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 680%
R1                        
R2                        
 

Calculated Properties of Goethite

Help on Electron Density: Electron Density:

relectron=4.13 gm/cc
note: rGoethite =4.27 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01349
Boson Index = 0.98651
Help on Photoelectric: Photoelectric:

PEGoethite = 18.93 barns/electron
U=PEGoethite x relectron= 78.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Goethite is Not Radioactive
 

Goethite Classification
Help on Dana Class: Dana Class: 6.1.1.2 (6)Hydroxides and Oxides Containing Hydroxyl
  (6.1)where X+++O OH
  (6.1.1)Diaspore group (Orthorhombic, Pnma or Pnmd)
 
6.1.1.1 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.2 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.3 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.4 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.5 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.6 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/F.06-30 IV - Oxides
  IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure
  IV/F.06 - Diaspore - Goethite - Faitknechtite series
 
IV/F.06-10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-20 Boehmite AlO(OH) Amam 2/m 2/m 2/m
 
IV/F.06-25 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-30 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-40 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m
 
IV/F.06-50 Akaganeite Fe(O,OH,Cl) I2/m 2/m
 
IV/F.06-60 Feroxyhyte FeO(OH) Unk Hex
 
IV/F.06-70 Manganite MnO(OH) B21/d 2/m
 
IV/F.06-80 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-90 Feitknechtite beta-MnO(OH) Unk Hex
 

Other Goethite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Goethite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - EUROmin Project 10 - Franklin Minerals(Dunn) 11 - Franklin Minerals(Palache) 12 - Glendale Community College 13 -Google Images 14 -Google Scholar 15 -Handbook of Mineralogy (UofA) 16 - HyperPhysics 17 -MinDAT 18 -MinMax(Deutsch) 19 -MinMax(English) 20 -Mineralienatlas (Deutsch) 21 - Minerals of Wisconsin 22 -QUT Mineral Atlas 23 - Scandinavian mineral gallery 24 -University of Colorado - Mineral Structure Data 25 - University of Manchester - Mineral Structure 26 -University of Minnesota 27 - WWW-MINCRYST 28 -theimage 29 -École des Mines de Paris

Search for Goethite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Goethite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Goethite Mineral Data :

Ask about Goethite 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 Goethite Specimen Label here :

Goethite

Fe+++O(OH)
Dana No: 6.1.1.2 Strunz No: IV/F.06-30
Locality:

 

Notes:

 
 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links