| |
 |
Jahnsite-(CaFeFe) Mineral Data
|
|
|
General Jahnsite-(CaFeFe) Information
|
 Chemical Formula: |
(Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2•8(H2O) |
| 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 |
| Empirical Formula: |
Ca0.6Mn2+0.6Fe2+1.9Mg0.8Fe3+1.9Al0.1(PO4)4�10(H2O) |
| Environment: |
Pliocene-Pleistocene clay deposits in vivianite nodules and secondary phosphates. |
| IMA Status: |
Not Approved IMA (Dana # Added) |
| Locality: |
Hime-Shima, Oita Prefecute and Kobe, Hyogo Prefecture, western Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. |
| Name Pronunciation: |
Jahnsite-(CaFeFe)  |
| |
Jahnsite-(CaFeFe) Crystallography
|
| Axial Ratios: |
a:b:c =2.0849:1:1.3802 |
| Cell Dimensions: |
a = 14.97, b = 7.18, c = 9.91, Z = 2; beta = 110.5° V = 997.72 Den(Calc)= 2.83 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a |
| 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)
|
| Color: |
Dark brown. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Hardness: |
4 - Fluorite |
| Luster: |
Vitreous - Adamantine |
| |
Optical Properties of Jahnsite-(CaFeFe)
|
| Optical Data: |
NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.2462) where Ncalc=Dcalc*KC+1
|
| |
Calculated Properties of Jahnsite-(CaFeFe)
|
| Electron Density: |
Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Jahnsite-(CaFeFe) =2.83 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.0078441697
Boson Index = 0.9921558303 |
| Photoelectric: |
PEJahnsite-(CaFeFe) = 9.39 barns/electron
U=PEJahnsite-(CaFeFe) x rElectron Density= 26.50 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jahnsite-(CaFeFe) is Not Radioactive |
| |
Jahnsite-(CaFeFe) Classification
|
| Dana Class: |
42.11.03.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
| |
(42.11)where (AB)4 (XO4)3 Zq � x(H2O) |
| |
(42.11.03)Whiteite Group |
| |
42.11.03.01 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m |
| |
42.11.03.02 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
| |
42.11.03.03 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
| |
42.11.03.04 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m |
| |
42.11.03.05 Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
| |
42.11.03.06 Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m |
| |
42.11.03.07 Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m |
| |
42.11.03.08 Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m |
| 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
|
| References: |
NAME( AmMin, Vol 86, p 1114) PHYS. PROP.(AmMin, Vol 86, p 1114) |
| 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
Search for Jahnsite-(CaFeFe) using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Jahnsite-(CaFeFe) :
Ask about Jahnsite-(CaFeFe) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Español
Print or Cut-and-Paste your Jahnsite-(CaFeFe) Specimen Label here :
|
Jahnsite-(CaFeFe)
(Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2•8(H2O)
Dana No: 42.11.03.05 Strunz No: 08.DH.15
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.