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Jahnsite-(CaMnFe) Mineral Data
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General Jahnsite-(CaMnFe) Information
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Chemical Formula: |
CaMn++Fe++2Fe+++2(PO4)4(OH)2•8(H2O) |
Composition: |
Molecular Weight = 876.43 gm |
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Calcium 4.57 % Ca 6.40 % CaO |
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Manganese 6.27 % Mn 8.09 % MnO |
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Iron 25.49 % Fe 16.40 % FeO / 18.22 % Fe2O3 |
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Phosphorus 14.14 % P 32.39 % P2O5 |
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Hydrogen 2.07 % H 18.50 % H2O |
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Oxygen 47.46 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
CaMn2+Fe2+2Fe3+2(PO4)4(OH)2•8(H2O) |
IMA Status: |
Approved IMA 1978 |
Locality: |
Fletcher mine, North Groton, New Hampsire, USA. 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-(CaMnFe) |
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Jahnsite-(CaMnFe) Image |
Images:
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Jahnsite-(CaMnFe)
Comments: Orange-brown microcrystalline jahnsite-(CaMnFe) associated with quartz.
Location: Voron'i Tundry, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
Scale: See Image.
© Rruff Database |
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Jahnsite-(CaMnFe) Crystallography
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Axial Ratios: |
a:b:c =2.0993:1:1.3804 |
Cell Dimensions: |
a = 15.01, b = 7.15, c = 9.87, Z = 2; beta = 111.23° V = 987.38 Den(Calc)= 2.95 |
Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a |
X Ray Diffraction: |
By Intensity(I/Io): 9.15(1), 2.81(0.5), 4.6(0.4),3.45(0.3), 3.48(0.3), 1.874(0.2), 4.96(0.2), 4.84(0.1), |
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Physical Properties of Jahnsite-(CaMnFe)
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Cleavage: |
{001} Good |
Color: |
Brown, Purplish brown, Yellow, Yellow orange. |
Density: |
2.86 |
Diaphaneity: |
Transparent to Translucent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Hardness: |
4 - Fluorite |
Luster: |
Vitreous - Adamantine |
Streak: |
white |
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Optical Properties of Jahnsite-(CaMnFe)
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Optical Data: |
NCalc= 1.71 - from Gladstone-Dale relationship (KC = 0.2398) where Ncalc=Dcalc*KC+1 NCalc= 1.69 - from Gladstone-Dale relationship (KC = 0.2398) where Ncalc=Dmeas*KC+1
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Calculated Properties of Jahnsite-(CaMnFe)
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Electron Density: |
Bulk Density (Electron Density)=2.93 gm/cc note: Specific Gravity of Jahnsite-(CaMnFe) =2.95 gm/cc. |
Fermion Index: |
Fermion Index = 0.0056962282 Boson Index = 0.9943037718 |
Photoelectric: |
PEJahnsite-(CaMnFe) = 10.33 barns/electron U=PEJahnsite-(CaMnFe) x rElectron Density= 30.24 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Jahnsite-(CaMnFe) is Not Radioactive |
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Jahnsite-(CaMnFe) Classification
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Dana Class: |
42.11.02.02 (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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(42.11.02)Jahnsite Group |
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42.11.02.01 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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42.11.02.02 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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42.11.02.03 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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42.11.02.04 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
Strunz Class: |
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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08.DH.15 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21/a 2/m |
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08.DH.15 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m |
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08.DH.15 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m |
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08.DH.15 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m |
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08.DH.15 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m |
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08.DH.15 Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m |
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08.DH.15 Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m |
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08.DH.15 Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m |
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Other Jahnsite-(CaMnFe) Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) |
See Also: |
Links to other databases for Jahnsite-(CaMnFe) :
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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Print or Cut-and-Paste your Jahnsite-(CaMnFe) Specimen Label here :
Jahnsite-(CaMnFe)
CaMn++Fe++2Fe+++2(PO4)4(OH)2•8(H2O)
Dana No: 42.11.02.02 Strunz No: 08.DH.15
Locality:
Notes:
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