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Laubmannite Mineral Data
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General Laubmannite Information
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 Chemical Formula: |
Fe++3Fe+++6(PO4)4(OH)12 |
| Composition: |
Molecular Weight = 1,086.60 gm |
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Iron 46.26 % Fe 19.84 % FeO / 44.09 % Fe2O3 |
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Phosphorus 11.40 % P 26.13 % P2O5 |
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Hydrogen 1.11 % H 9.95 % H2O |
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Oxygen 41.23 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Fe2+3Fe3+6(PO4)4(OH)12 |
| Environment: |
Mixture of dufrenite, kidwellite and beraunite. |
| IMA Status: |
Discredited IMA 1990 |
| Locality: |
Shady, Polk Co., Arkansas, USA Link to MinDat.org Location Data. |
| Name Origin: |
Named for Heinrich Laubmann (1865-1951), German mineralogist. |
| Synonym: |
Discredited |
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Laubmannite Image |
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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 |
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Laubmannite Crystallography
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| Crystal System: |
Orthorhombic Space Group: Unk |
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Physical Properties of Laubmannite
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| Color: |
Brown, Greenish brown, Grayish green, Yellow green, Dark green. |
| Density: |
3.33 |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Vitreous - Silky |
| Streak: |
greenish |
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Optical Properties of Laubmannite
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| Optical Data: |
NCalc= 1.86 - from Gladstone-Dale relationship (KC = 0.2578) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Laubmannite
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| Electron Density: |
Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Laubmannite =3.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PELaubmannite = 14.38 barns/electron
U=PELaubmannite x rElectron Density= 46.70 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laubmannite is Not Radioactive |
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Laubmannite Classification
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| Dana Class: |
37.00.00.00 (37)Phosphate Minerals |
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(37.00)Without Dana Classification Numbers |
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(37.00.00)Phosphate, Basic |
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37.00.00.00 Arnhemite* (K,Na)2Mg2(P2O7)•5(H2O) Unk Hex |
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37.00.00.00 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m |
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37.00.00.00 Auroantimonate* AuSbO3 Ortho ? Ortho |
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37.00.00.00 Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O)
I 42m 4 2m |
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37.00.00.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m |
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37.00.00.00 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono |
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37.00.00.00 Gengenbachite KFe3(H2PO4)2(HPO4)4•6H2OorKFe3H8(PO4)6•6H2O P 63mc 6mm |
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37.00.00.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m |
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37.00.00.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m |
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37.00.00.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1 |
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37.00.00.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m |
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37.00.00.00 Krasnoselskite* CoWO4 P 2/c 2/m |
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37.00.00.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho |
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37.00.00.00 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4•6(H2O) Mono |
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37.00.00.00 Parwanite (Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7•30H2O P 2, Pm, P 2/m, P 21, Mono |
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37.00.00.00 Pyrocoproite* (Mg(K,Na))2P2O7 Unk Mono |
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37.00.00.00 Pyrophosphite* K2CaP2O7 P 21/n 2/m |
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37.00.00.00 Zinclavendulan? NaCa(Zn,Cu)5(AsO4)4Cl•4-5(H2O) Unk Ortho |
| Strunz Class: |
08.XX.00 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.X - Unclassified Strunz PHOSPHATES, ARSENATES, VANADATES |
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08.XX -Phosphate, Basic |
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08.XX.00 Arsenobismite? Bi2(AsO4)(OH)3 Unk Ortho |
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08.XX.00 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8•4-5(H2O) P1 1 |
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08.XX.00 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m |
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08.XX.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m |
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08.XX.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m |
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08.XX.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho |
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08.XX.00 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m |
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08.XX.00 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho |
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08.XX.00 Viseite Ca10Al24(SiO4)6(PO4)7O22F3•72(H2O)(?) I a3d 4/m 3 2/m |
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08.XX.00 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8•4(H2O)(?) C 2/c ? 2/m |
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08.XX.00 Sodium-autunite Na2(UO2)2(PO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m |
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08.XX.00 Sodium meta-autunite! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m |
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08.XX.00 Slavkovite! Cu13(AsO4)6(AsO3OH)4•23(H2O) P1 1 |
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08.XX.00 IMA2000-020! Fe4[AsO3OH]5[AsO2(OH)2]2•20(H2O) Ortho Ortho |
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08.XX.00 Lewisite! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m |
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08.XX.00 Kamarizaite! Fe3(AsO4)2(OH)3•3H2O Pccm, Pcc2, Pcmm, Pcm21 Ortho |
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08.XX.00 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m |
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08.XX.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m |
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08.XX.00 IMA2009-002! Cu3(AsO4)2 P 21/c 2/m |
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08.XX.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m |
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08.XX.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1 |
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Other Laubmannite Information
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| See Also: |
Links to other databases for Laubmannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Laubmannite
Fe++3Fe+++6(PO4)4(OH)12
Dana No: 37.00.00.00 Strunz No: 08.XX.00
Locality:
Notes:
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