Rittmannite Mineral Data + Say RITTMANNITE


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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 IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Link to MinDat.org Location Data.
 

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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 - PrismaticH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.80 gm/cc
note: rRittmannite =2.81 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00178
Boson Index = 0.99822
Help on Photoelectric: Photoelectric:

PERittmannite = 6.63 barns/electron
U=PERittmannite x relectron= 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: 42.11.3.4 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq · x(H2O)
  (42.11.3)Dana Group
 
42.11.3.1 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 21/a 2/m
 
42.11.3.2 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
42.11.3.3 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
42.11.3.4 Rittmannite MnMnFeAl2(OH)2(PO4)4·8(H2O) P 2/a 2/m
Help on  Strunz Class: Strunz Class: VII/D.29-40 VII - Phosphates, Arsenates and Vanadates
  VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K
  VII/D.29 - Whiteite - Jahnsite group
 
VII/D.29-10 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 21/a 2/m
 
VII/D.29-20 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
VII/D.29-30 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
VII/D.29-40 Rittmannite MnMnFeAl2(OH)2(PO4)4·8(H2O) P 2/a 2/m
 
VII/D.29-50 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
VII/D.29-60 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
VII/D.29-70 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
VII/D.29-75 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m
 
VII/D.29-80 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3·2(H2O) P 21/a 2/m
 

Other Rittmannite Information

Help on References: References: 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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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: 42.11.3.4 Strunz No: VII/D.29-40
Locality:

 

Notes:

 

 
   
 
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