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Gengenbachite Mineral Data
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General Gengenbachite Information
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 Chemical Formula: |
KFe3(H2PO4)2(HPO4)4•6H2O or KFe3H8(PO4)6•6H2O |
| Composition: |
Molecular Weight = 892.62 gm |
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Potassium 4.38 % K 5.28 % K2O |
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Iron 18.77 % Fe 24.15 % FeO |
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Phosphorus 20.82 % P 47.71 % P2O5 |
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Hydrogen 2.26 % H 20.18 % H2O |
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Oxygen 53.77 % O |
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______ ______ |
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100.00 % 97.31 % = TOTAL OXIDE |
| Empirical Formula: |
KFe2+3H8(PO4)6•6(H2O) |
| IMA Status: |
Proposed IMA 2006 |
| Locality: |
Grube Silberbr�nnle, Haigerach Valley near Gengenbach, Central Black Forest, Germany Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Synonym: |
IMA2001-003b |
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Gengenbachite Crystallography
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| Axial Ratios: |
a:c = 1:1.84649 |
| Cell Dimensions: |
a = 9.12, c = 16.84, V = 1,213.00 |
| Crystal System: |
Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63mc |
| X Ray Diffraction: |
By Intensity(I/Io): 7.16(1), 3.09(0.8), 4.57(0.7),3.23(0.6), 2.81(0.5), 3.57(0.5), 2.87(0.4), 7.89(0.4), |
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Optical Properties of Gengenbachite
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| Optical Data: |
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Calculated Properties of Gengenbachite
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| Fermion Index: |
Fermion Index = 0.0042458883
Boson Index = 0.9957541117 |
| Photoelectric: |
PEGengenbachite = 6.94 barns/electron
U=PEGengenbachite x relectron= . barns/cc.
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| Radioactivity: |
GRapi = 63.29 (Gamma Ray American Petroleum Institute Units)
Concentration of Gengenbachite per GRapi unit = 1.58 (%)
Estimated Radioactivity from Gengenbachite  - barely detectable
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Gengenbachite 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 Hydrated |
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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.CA.65 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CA -With small and large/medium cations |
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08.CA.65 Gengenbachite KFe3(H2PO4)2(HPO4)4•6H2OorKFe3H8(PO4)6•6H2O P 63mc 6mm |
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Other Gengenbachite Information
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| See Also: |
Links to other databases for Gengenbachite :
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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Gengenbachite
KFe3(H2PO4)2(HPO4)4•6H2O or KFe3H8(PO4)6•6H2O
Dana No: 37.00.00.00 Strunz No: 08.CA.65
Locality:
Notes:
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