Jahnsite-(CaMnMn) Mineral Data

General Jahnsite-(CaMnMn) Information

Chemical Formula: CaMn++Mn++2Fe+++2(PO4)4(OH)2•8(H2O) Composition: Molecular Weight = 874.61 gm    Calcium      4.58 %  Ca    6.41 % CaO    Manganese   18.84 %  Mn   24.33 % MnO    Iron        12.77 %  Fe   18.26 % Fe₂O₃    Phosphorus  14.17 %  P    32.46 % P₂O₅    Hydrogen     2.07 %  H    18.54 % H₂O    Oxygen      47.56 %  O               ______        ______                100.00 %      100.00 % = TOTAL OXIDE Empirical Formula: CaMn²⁺Mn²⁺₂Fe³⁺₂(PO₄)₄(OH)₂•8(H₂O) IMA Status: Approved IMA 1990 Locality: Mangualde pegmatite, Beira, Portugal. 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-(CaMnMn) Synonym: IMA1987-020  

Jahnsite-(CaMnMn) Image

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Jahnsite-(CaMnMn) Crystallography

Axial Ratios: a:b:c =2.0815:1:1.3934 Cell Dimensions: a = 14.887, b = 7.152, c = 9.966, Z = 2; beta = 109.77° V = 998.55 Den(Calc)= 2.91 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a X Ray Diffraction: By Intensity(I/I_o): 9.4(1), 2.87(0.8), 4.704(0.3),  

Physical Properties of Jahnsite-(CaMnMn)

Cleavage: None Color: Brownish yellow. Density: 2.78 Diaphaneity: Transparent Hardness: 4 - Fluorite Luster: Vitreous (Glassy) Streak: white  

Optical Properties of Jahnsite-(CaMnMn)

Gladstone-Dale: CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.226,KPDmeas= 0.2366,KC= 0.2413
Ncalc = 1.67 - 1.7 Optical Data: Biaxial (-), a=1.643, b=1.659, g=1.671, bire=0.0280, 2V(Calc)=80, 2V(Meas)=80-81.  

Calculated Properties of Jahnsite-(CaMnMn)

Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Jahnsite-(CaMnMn) =2.78 gm/cc.
Fermion Index: Fermion Index = 0.0030006706
Boson Index = 0.9969993294 Photoelectric: PE_{Jahnsite-(CaMnMn)} = 9.76 barns/electron
U=PE_{Jahnsite-(CaMnMn)} x rElectron Density= 26.87 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jahnsite-(CaMnMn) is Not Radioactive  

Jahnsite-(CaMnMn) Classification

Dana Class: 42.11.02.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen   (42.11)where (AB)4 (XO4)3 Zq · x(H2O)   (42.11.02)Jahnsite Group  

42.11.02.01 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

 

42.11.02.02 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

 

42.11.02.03 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

 

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   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-(CaMnMn) Information

References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.75,p401-404,1990) See Also: Links to other databases for Jahnsite-(CaMnMn) :
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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