Arrojadite-(PbFe) Mineral Data

General Arrojadite-(PbFe) Information

Chemical Formula:

PbFe++Na2Ca(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2

Composition:

Molecular Weight = 2,242.59 gm

Sodium 2.05 % Na 2.76 % Na₂O

Calcium 1.79 % Ca 2.50 % CaO

Magnesium 1.08 % Mg 1.80 % MgO

Manganese 9.80 % Mn 12.65 % MnO

Aluminum 1.20 % Al 2.27 % Al₂O₃

Iron 22.41 % Fe 28.83 % FeO

Phosphorus 16.57 % P 37.98 % P₂O₅

Hydrogen 0.11 % H 1.00 % H₂O

Lead 9.24 % Pb 9.95 % PbO

Oxygen 35.31 % O

Fluorine 0.42 % F 0.42 % F

- % F -0.18 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe²⁺Na₂CaFe²⁺₈Mn²⁺₄MgAl(PO₄)₁₁(PO₃OH)(OH)_1.5F_0.5

Environment:

Occurred with walnut-sized black grains of metamict � llowite. Arrojadite group

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Sapucaia pegmatite, Galilea, Rio Doce basin, Minas Gerais, Brazil Link to MinDat.org Location Data.

Name Origin:

Named after arrojadite and site occupancy of the arrojadite structure.

Name Pronunciation:

Arrojadite-(PbFe) + Pronunciation

Synonym:

IMA2005-056

Arrojadite-(PbFe) Crystallography

Axial Ratios:

a:b:c =1.6472:1:2.4649

Cell Dimensions:

a = 16.4304, b = 9.9745, c = 24.5869, Z = 4; beta = 105.485° V = 3,883.16 Den(Calc)= 3.84

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cc

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

By Intensity(I/I_o): 3.0186(1), 2.6982(0.548), 3.2082(0.431),2.8291(0.35), 2.8196(0.329), 2.6941(0.323), 2.5376(0.304), 2.7496(0.291), 2.8132(0.287),

Physical Properties of Arrojadite-(PbFe)

Color:

Pale honey.

Diaphaneity:

Transparent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Arrojadite-(PbFe)

Gladstone-Dale:

CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1724,KC= 0.1843
Ncalc = 1.71

Optical Data:

Biaxial (+), a=1.6585, b=1.66, g=1.668, bire=0.0095, 2V(Calc)=48, 2V(Meas)=57.5. Dispersion r > v.

Calculated Properties of Arrojadite-(PbFe)

Electron Density:

Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Arrojadite-(PbFe) =3.84 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Arrojadite-(PbFe)}= 159.73 barns/electron
U=PE_{Arrojadite-(PbFe)} x rElectron Density= 583.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arrojadite-(PbFe) is Not Radioactive

Arrojadite-(PbFe) Classification

Dana Class:

41.07.02a.07 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.07)where (A B)m (XO4)4 Zq

(41.07.02a)Arrojadite Group (Arrojadite Subgroup) (Al in Al site, OH in W site, Fe in M site)

41.07.02a.00 Arrojadite! KNa4CaMn4Fe10Al(PO4)12(OH,F)2 Cc m

41.07.02a.01 Arrojadite-(KNa)! KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

41.07.02a.02 Arrojadite-(KFe)! KNa2CaNa2(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

41.07.02a.03 Arrojadite-(NaFe)! NaNa2CaNa2(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

41.07.02a.04 Arrojadite-(BaNa)! BaFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

41.07.02a.05 Arrojadite-(BaFe)! (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2 Cc m

41.07.02a.06 Arrojadite-(SrFe)! SrFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

41.07.02a.07 Arrojadite-(PbFe)! PbFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

Strunz Class:

08.BF.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BF -With medium-sized and large cations, (OH, etc.):RO4 < 0.5:1

08.BF.05 Arrojadite! KNa4CaMn4Fe10Al(PO4)12(OH,F)2 Cc m

08.BF.05 Dickinsonite! KNa4Ca(Mn,Fe)14Al(PO4)12(OH)2 Cc m

08.BF.05 Arrojadite-(BaFe)! (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Arrojadite-(KFe)! KNa2CaNa2(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Arrojadite-(NaFe)! NaNa2CaNa2(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Arrojadite-(SrFe)! SrFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Arrojadite-(KNa)! KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Dickinsonite-(KNa)! KNa4Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

08.BF.05 Arrojadite-(PbFe)! PbFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Fluorarrojadite-(BaNa)! BaFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(F,OH)2 Cc m

08.BF.05 Arrojadite-(BaNa)! BaFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2 Cc m

08.BF.05 Fluorarrojadite-(KNa)! KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(F,OH)2 Cc m

08.BF.05 Fluorarrojadite-(BaFe)! (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(PO4)11(PO3OH)(F,OH)2 Cc m

08.BF.05 Ferri-arrojadite-(BaNa)! BaFeNa2Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(F,OH)2 Cc m

08.BF.05 Dickinsonite-(KMnNa)! KNaMnNa3Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

08.BF.05 Dickinsonite-(KNaNa)! KNaNa4Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

08.BF.05 Dickinsonite-(NaNa)! Na2Na4Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

Other Arrojadite-(PbFe) Information

References:

NAME( AmMin, v91, p1270) PHYS. PROP.(AmMin, v91, p1270) OPTIC PROP.(AmMin, v91, p1270)

See Also:

Links to other databases for Arrojadite-(PbFe) :
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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Arrojadite-(PbFe)

PbFe++Na2Ca(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Dana No: 41.07.02a.07 Strunz No: 08.BF.05
Locality:

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