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Jahnsite-(CaFeFe) Mineral Data

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General Jahnsite-(CaFeFe) Information

Help on Chemical  Formula: Chemical Formula: (Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 851.41 gm
   Calcium      2.82 %  Ca    3.95 % CaO
   Magnesium    2.28 %  Mg    3.79 % MgO
   Manganese    3.87 %  Mn    5.00 % MnO
   Aluminum     0.32 %  Al    0.60 % Al2O3
   Iron        24.93 %  Fe   16.03 % FeO / 17.82 % Fe2O3
   Phosphorus  14.55 %  P    33.34 % P2O5
   Hydrogen     2.37 %  H    21.16 % H2O
   Oxygen      48.86 %  O
              ______        ______ 
              100.00 %      101.69 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.6Mn2+0.6Fe2+1.9Mg0.8Fe3+1.9Al0.1(PO4)4�10(H2O)
Help on Environment: Environment: Pliocene-Pleistocene clay deposits in vivianite nodules and secondary phosphates.
Help on IMA Status: IMA Status: Not Approved IMA (Dana # Added)
Help on Locality: Locality: Hime-Shima, Oita Prefecute and Kobe, Hyogo Prefecture, western Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.
Help on Name Pronunciation: Name Pronunciation: Jahnsite-(CaFeFe) Say JAHNSITE-(CAFEFE)

Jahnsite-(CaFeFe) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0849:1:1.3802
Help on Cell Dimensions: Cell Dimensions: a = 14.97, b = 7.18, c = 9.91, Z = 2; beta = 110.5° V = 997.72 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: 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)

Help on Color: Color: Dark brown.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous - Adamantine

Optical Properties of Jahnsite-(CaFeFe)

Help on Optical Data: Optical Data: NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.2462) where Ncalc=Dcalc*KC+1

Calculated Properties of Jahnsite-(CaFeFe)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Jahnsite-(CaFeFe) =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0078441697
Boson Index = 0.9921558303
Help on Photoelectric: Photoelectric: PEJahnsite-(CaFeFe) = 9.39 barns/electron
U=PEJahnsite-(CaFeFe) x rElectron Density= 26.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jahnsite-(CaFeFe) is Not Radioactive

Jahnsite-(CaFeFe) Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.03)Whiteite Group Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
Help on  Strunz Class: Strunz Class: 08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.15 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21/a 2/m
08.DH.15 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m
08.DH.15 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m
08.DH.15 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m
08.DH.15 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
08.DH.15 Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
08.DH.15 Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m

Other Jahnsite-(CaFeFe) Information

Help on References: References: NAME( AmMin, Vol 86, p 1114) PHYS. PROP.(AmMin, Vol 86, p 1114)
Help on See Also: See Also: 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

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Dana No: Strunz No: 08.DH.15





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