General Jahnsite-(CaFeFe) Information![]() (Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2•8(H2O) |
![]() Molecular Weight = 851.41 gm |
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Calcium 2.82 % Ca 3.95 % CaO |
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Magnesium 2.28 % Mg 3.79 % MgO |
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Manganese 3.87 % Mn 5.00 % MnO |
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Aluminum 0.32 % Al 0.60 % Al2O3 |
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Iron 24.93 % Fe 16.03 % FeO / 17.82 % Fe2O3 |
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Phosphorus 14.55 % P 33.34 % P2O5 |
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Hydrogen 2.37 % H 21.16 % H2O |
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Oxygen 48.86 % O |
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100.00 % 101.69 % = TOTAL OXIDE |
![]() Ca0.6Mn2+0.6Fe2+1.9Mg0.8Fe3+1.9Al0.1(PO4)4·10(H2O) |
![]() Pliocene-Pleistocene clay deposits in vivianite nodules and secondary phosphates. |
![]() Not Approved IMA (Dana # Added) |
![]() Hime-Shima, Oita Prefecute and Kobe, Hyogo Prefecture, western Japan. Link to MinDat.org Location Data. |
![]() Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. |
![]() Jahnsite-(CaFeFe) |
![]() | | Search for Jahnsite-(CaFeFe) Images
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| | Jahnsite-(CaFeFe) Crystallography![]() a:b:c =2.0849:1:1.3802 |
![]() a = 14.97, b = 7.18, c = 9.91, Z = 2; beta = 110.5° V = 997.72 Den(Calc)= 2.83 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a |
![]() By Intensity(I/Io): 9.28(1)(001), 4.642(0.5)(002), 2.834(0.35)(302),1.947(0.15)(024,405), 3.091(0.12)(412), 5.017(0.12)(210), |
| Physical Properties of Jahnsite-(CaFeFe)![]() Dark brown. |
![]() Aggregates - Made of numerous individual crystals or clusters. |
![]() Encrustations - Forms crust-like aggregates on matrix. |
![]() 4 - Fluorite |
![]() Vitreous - Adamantine |
| Optical Properties of Jahnsite-(CaFeFe)![]() NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.2462) where Ncalc=Dcalc*KC+1 |
| Calculated Properties of Jahnsite-(CaFeFe)![]() Bulk Density (Electron Density)=2.82 gm/cc |
note: Specific Gravity of Jahnsite-(CaFeFe) =2.83 gm/cc. ![]() Fermion Index = 0.0078441697 |
Boson Index = 0.9921558303 ![]() PEJahnsite-(CaFeFe) = 9.39 barns/electron |
U=PEJahnsite-(CaFeFe) x rElectron Density= 26.50 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Jahnsite-(CaFeFe) is Not Radioactive | Jahnsite-(CaFeFe) Classification![]() 42.11.03.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.11)where (AB)4 (XO4)3 Zq · x(H2O) |
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(42.11.03)Whiteite Group |
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![]() 08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1 |
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| Other Jahnsite-(CaFeFe) Information![]() NAME( AmMin, Vol 86, p 1114) PHYS. PROP.(AmMin, Vol 86, p 1114) |
![]() Links to other databases for Jahnsite-(CaFeFe) : |
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 Search for Jahnsite-(CaFeFe) using: Visit our Advertisers for Jahnsite-(CaFeFe) : A Bijoux Google Search for Jahnsite-(CaFeFe)Adam's Minerals Google Search for Jahnsite-(CaFeFe) Cape Minerals Google Search for Jahnsite-(CaFeFe) Dakota Matrix Minerals Google Search for Jahnsite-(CaFeFe) Excalibur Mineral Corp. Google Search for Jahnsite-(CaFeFe) Exceptional Minerals Google Search for Jahnsite-(CaFeFe) John Betts Fine Minerals Search for Jahnsite-(CaFeFe) McDougall Minerals Google Search for Jahnsite-(CaFeFe) Mineral News Website Link Rock and Mineral Shows Google Search for Jahnsite-(CaFeFe) Weinrich Minerals, Inc. Google Search for Jahnsite-(CaFeFe) Ask about Jahnsite-(CaFeFe) here : Print or Cut-and-Paste your Jahnsite-(CaFeFe) Specimen Label here :
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