Rittmannite Mineral Data

Rittmannite Mineral Data +

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General Rittmannite Information

Chemical Formula:

Mn++Mn++Fe++Al2(OH)2(PO4)4·8(H2O)

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

Empirical Formula:

Mn²⁺₂Fe²⁺Al₂(OH)₂(PO₄)₄·8(H₂O)

IMA Status:

Approved IMA 1989

Locality:

Link to MinDat.org Location Data.

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Rittmannite Crystallography

Axial Ratios:

a:b:c =2.1785:1:1.4746

Cell Dimensions:

a = 15.01, b = 6.89, c = 10.16, Z = 2; beta = 112.82° V = 968.49 Den(Calc)= 2.67

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.38(1), 2.802(0.8), 4.69(0.5),

Physical Properties of Rittmannite

Cleavage:

[???] Indistinct

Color:

Light yellow.

Density:

2.81

Diaphaniety:

Transparent

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rittmannite

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

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

Electron Density:

r_electron=2.80 gm/cc
note: r_Rittmannite=2.81 gm/cc.

Fermion Index

Fermion Index = 0.00178
Boson Index = 0.99822

Photoelectric:

PE_Rittmannite= 6.63 barns/electron
U=PE_Rittmannite x r_electron= 18.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rittmannite is Not Radioactive

Rittmannite Classification

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

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

References:

PHYS. PROP.(Am.Min.,Vol.75,p932,1990) OPTIC PROP.(Am.Min.,Vol.75,p932,1990)

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: