Laubmannite Mineral Data


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General Laubmannite Information

Help on Chemical  Formula: Chemical Formula: Fe++3Fe+++6(PO4)4(OH)12
Help on Composition: Composition: Molecular Weight = 1,086.60 gm
   Iron        46.26 %  Fe   19.84 % FeO / 44.09 % Fe2O3
   Phosphorus  11.40 %  P    26.13 % P2O5
   Hydrogen     1.11 %  H     9.95 % H2O
   Oxygen      41.23 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+3Fe3+6(PO4)4(OH)12
Help on Environment: Environment: Mixture of dufrenite, kidwellite and beraunite.
Help on IMA Status: IMA Status: Discredited IMA 1990
Help on Locality: Locality: Shady, Polk Co., Arkansas, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Heinrich Laubmann (1865-1951), German mineralogist.
Help on Synonym: Synonym: Discredited
 

Laubmannite Image

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

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

Laubmannite Crystallography

Help on Crystal System: Crystal System: OrthorhombicSpace Group: Unk
 

Physical Properties of Laubmannite

Help on Color: Color: Brown, Greenish brown, Grayish green, Yellow green, Dark green.
Help on Density: Density: 3.33
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: greenish
 

Calculated Properties of Laubmannite

Help on Electron Density: Electron Density:

relectron=3.25 gm/cc
note: rLaubmannite =3.33 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric:

PELaubmannite = 14.38 barns/electron
U=PELaubmannite x relectron= 46.70 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laubmannite is Not Radioactive

 

Laubmannite Classification

Help on  Dana Class: Dana Class: 37.0.0.0 (37)Phosphate Minerals
  (37.0)Without Dana Classification Numbers
  (Phosphate, Basic)
Help on  Strunz Class: Strunz Class: VII/B.14-10 VII - Phosphates, Arsenates and Vanadates
  VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds
  VII/B.14 - Pseudomalachite group, Laubmannite series
 
VII/B.14-10 Laubmannite Fe3Fe6(PO4)4(OH)12 Unk Ortho
 

Other Laubmannite Information

Help on See Also: See Also: Links to other databases for Laubmannite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Laubmannite

Fe++3Fe+++6(PO4)4(OH)12
Dana No: Unknown Strunz No: VII/B.14-10
Locality:

 

Notes:

 

 
   
 
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