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Rittmannite Mineral Data

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General Rittmannite Information

Help on Chemical  Formula: Chemical Formula: Mn++Mn++Fe++Al2(OH)2(PO4)4•8(H2O)
Help on Composition: Composition: Molecular Weight = 777.71 gm
   Manganese   14.13 %  Mn   18.24 % MnO
   Aluminum     6.94 %  Al   13.11 % Al2O3
   Iron         7.18 %  Fe    9.24 % FeO
   Phosphorus  15.93 %  P    36.50 % P2O5
   Hydrogen     2.33 %  H    20.85 % H2O
   Oxygen      53.49 %  O
              ______        ______ 
              100.00 %       97.94 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+2Fe2+Al2(OH)2(PO4)4•8(H2O)
Help on Environment: Environment: Rare mineral in phosphatic nodules in zoned granite pegmatite veins.
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Mangualde pegmatite, near Mesquitela, and the Bendada pegmatite, near Guarda, Portugal. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alfred Rittmann (1893-1980), German petrologist and volcanologist, University of Catania, Catania, Italy.
Help on Name Pronunciation: Name Pronunciation: Rittmannite + Pronunciation Say RITTMANNITE
 

Rittmannite Image

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  Rittmannite

Comments: SEM image of rittmannite crystals on massive adularia. (CanMin, v27:447).
Location: Found in altered phosphatic "nodules" from the Mangualde granitic pegmatite, Portugal. Scale: 240 X.
© Canadian Mineralogist

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  Rittmannite

Comments: Light yellow, opaque, microcrystalline rittmannite on matrix.
Location: El Galineiro, Vigo, Pontevedra, Spain. Scale: Specimen Size 2.4 x 2.1 x 1.1 cm.
© John Veevaert

Rittmannite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1785:1:1.4746
Help on Cell Dimensions: Cell Dimensions: a = 15.01, b = 6.89, c = 10.16, Z = 2; beta = 112.82° V = 968.49 Den(Calc)= 2.67
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): 9.38(1), 2.802(0.8), 4.69(0.5),
 

Physical Properties of Rittmannite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Light yellow.
Help on Density: Density: 2.81
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Rittmannite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.09 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2377,KPDmeas= 0.2259,KC= 0.2181
Ncalc = 1.58 - 1.61
Help on Optical Data: Optical Data: Biaxial (+), a=1.622, b=1.628, g=1.654, bire=0.0320, 2V(Calc)=52, 2V(Meas)=43.
 

Calculated Properties of Rittmannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Rittmannite =2.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017826091
Boson Index = 0.9982173909
Help on Photoelectric: Photoelectric: PERittmannite = 6.63 barns/electron
U=PERittmannite x rElectron Density= 18.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rittmannite is Not Radioactive
 

Rittmannite Classification

Help on  Dana Class: Dana Class: 42.11.03.04 (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
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 Rittmannite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.75,p932,1990) OPTIC PROP.(Am.Min.,Vol.75,p932,1990)
Help on See Also: See Also: Links to other databases for Rittmannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Rittmannite Specimen Label here :

Rittmannite

Mn++Mn++Fe++Al2(OH)2(PO4)4•8(H2O)
Dana No: 42.11.03.04 Strunz No: 08.DH.15
Locality:

 

Notes:

 

 
   
 


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