Ludwigite Mineral Data + Say LUDWIGITE

General Ludwigite Information
Help on Chemical Formula: Chemical Formula: Mg2Fe+++BO5
Help on Composition: Composition: Molecular Weight = 195.26 gm
   Magnesium  24.89 %  Mg   41.28 % MgO
   Iron       28.60 %  Fe   40.89 % Fe2O3
   Boron       5.54 %  B    17.83 % B2O3
   Oxygen     40.97 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2Fe3+BO5
Help on Environment: Environment: Typically formed in a magnesian iron skarn and contact metamorphic deposits. Forms a series with vonsenite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1874
Help on Locality: Locality: Ocna de Fier (Vaskö, Morávica, Eisenstein), Banat, Romania Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Austrian chemist, Ernst Ludwig (1842-1915).
Help on Synonym: Synonym: ICSD 65435
  Magnesioludwighite
  PDF 46-1290
 

Ludwigite Image

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Ludwigite

Comments: Limonitic matrix with blue crystals of ludwigite.
Location: Simms Pass, Lemhi County, Idaho, USA. Scale: Crystal size 9 mm.
© John Veevaert
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Ludwigite   Chestermanite

Comments: Black capillary crystals of ludwigite with green inclusions of chestermanite in impure marble.
Location: Near Potter Pass, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Ludwigite

Comments: Bright black, radial fibrous aggregates of ludwigite.
Location: Brosso mine, Piemonte, Italy. Scale: Sample size 4x3 cm.
© Minernet

Ludwigite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.7553:1:0.2487
Help on Cell Dimensions: Cell Dimensions: a = 9.26, b = 12.26, c = 3.05, Z = 4; V = 346.26 Den(Calc)= 3.75
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.12(1), 2.515(0.7), 2.547(0.7),
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Irwin M B , Peterson R C , The Canadian Mineralogist , 37 (1999) p.939-943, The crystal structure of ludwigite, Locality: Crestmore quarry, California, USA

View Additional jPOWD Structure files for Ludwigite
[1]
 

Physical Properties of Ludwigite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Dark green, Black, Black green.
Help on Density: Density: 3.7 - 4, Average = 3.85
Help on Diaphaniety: Diaphaniety: Opaque to subtranslucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Silky
Help on Streak: Streak: greenish black
 

Optical Properties of Ludwigite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2404,KPDmeas= 0.2342,KC= 0.2497
Help on Optical Data: Optical Data: Biaxial (+), a=1.83-1.85, b=1.83-1.9, g=1.97-2.03, bire=0.1400-0.1800, 2V(Calc)=0-68, 2V(Meas)=Small. Dispersion r >> v extreme.
Help on Pleochroism (x): Pleochroism (x): dark green.
Help on Pleochroism (y): Pleochroism (y): dark green.
Help on Pleochroism (z): Pleochroism (z): dark reddish brown.
Help on RL Anisotrophism: RL Anisotrophism: Strong, yellowish brown to bluish violet gray.
Help on RL Bireflectance: RL Bireflectance: Pinkish gray to dark greenish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Ludwigite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   10.10   13.80 
   
 420 nm    9.70   13.20 
 440 nm    9.30   12.60 
 460 nm    9.00   12.10 
 480 nm    8.70   11.80 
 500 nm    8.50   11.50 
 520 nm    8.20   11.30 
 540 nm    8.10   11.20 
 560 nm    7.90   11.00 
 580 nm    7.80   10.90 
 600 nm    7.60   10.80 
 620 nm    7.50   10.80 
 640 nm    7.40   10.80 
 660 nm    7.30   10.80 
 680 nm    7.20   10.80 
 700 nm    7.20   10.90 
Calculated Relative Intensity Colors of Ludwigite in Air
Relative
Intensity		    0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R1                      
R2                      
 

Calculated Properties of Ludwigite

Help on Electron Density: Electron Density:

relectron=3.65 gm/cc
note: rLudwigite =3.75 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.04217
Boson Index = 0.95783
Help on Photoelectric: Photoelectric:

PELudwigite = 9.17 barns/electron
U=PELudwigite x relectron= 33.46 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ludwigite is Not Radioactive
 

Ludwigite Classification
Help on Dana Class: Dana Class: 24.2.1.1 (24)Borates - Anhydrous
  (24.2)where (A)2 BO2 [XO3]
  (24.2.1)Ludwigite Group (Space Group: Pbam)
 
24.2.1.1 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m
 
24.2.1.2 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m
 
24.2.1.3 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m
 
24.2.1.4 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m
 
24.2.1.5 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m
 
24.2.1.6 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: V/G.04-10 V - Nitrates, Carbonates and Borates
  V/G - "Insel" borates [BO3]3- "inseln"
  V/G.04 - Ludwigite group
 
V/G.04-10 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m
 
V/G.04-20 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m
 
V/G.04-30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m
 
V/G.04-40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m
 
V/G.04-50 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m
 
V/G.04-60 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m
 
V/G.04-70 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m
 
V/G.04-80 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m
 
V/G.04-90 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m
 
V/G.04-100 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 63 6
 

Other Ludwigite Information
Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5)
Help on See Also: See Also: Links to other databases for Ludwigite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - Scandinavian mineral gallery 14 - WWW-MINCRYST 15 -École des Mines de Paris

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

Ludwigite

Mg2Fe+++BO5
Dana No: 24.2.1.1 Strunz No: V/G.04-10
Locality:

 

Notes:

 
 
   
 
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