Arrojadite-(SrFe) Mineral Data

General Arrojadite-(SrFe) Information

Chemical Formula:

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

Composition:

Molecular Weight = 2,063.97 gm

Potassium 0.06 % K 0.07 % K₂O

Barium 1.33 % Ba 1.49 % BaO

Sodium 3.56 % Na 4.80 % Na₂O

Strontium 3.95 % Sr 4.67 % SrO

Lithium 0.00 % Li 0.01 % Li₂O

Calcium 1.15 % Ca 1.60 % CaO

Magnesium 4.25 % Mg 7.05 % MgO

Scandium 0.09 % Sc 0.13 % Sc₂O₃

Manganese 8.86 % Mn 11.44 % MnO

Aluminum 1.31 % Al 2.47 % Al₂O₃

Zinc 0.22 % Zn 0.28 % ZnO

Iron 17.97 % Fe 23.11 % FeO

Silicon 0.03 % Si 0.06 % SiO₂

Phosphorus 17.93 % P 41.09 % P₂O₅

Hydrogen 0.10 % H 0.92 % H₂O

Lead 0.30 % Pb 0.32 % PbO

Oxygen 38.06 % O

Fluorine 0.83 % F 0.83 % F

- % F -0.35 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr_0.93Na_3.2Ca_0.59Ba_0.2Pb_0.03K_0.03Fe²⁺_6.64Mg_3.61Mn²⁺_3.33Zn_0.07Li_0.01Sc_0.04Al(OH)_1.1 F_0.9P_11.95Si_0.02O₄₇(OH)

Environment:

Arrojadite group

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Horrsjöberg, Värmland, Sweden Link to MinDat.org Location Data.

Name Origin:

Named after arrojadite and site occupancy of the arrojadite structure.

Name Pronunciation:

Arrojadite-(SrFe) + Pronunciation

Synonym:

IMA2005-032

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Arrojadite-(SrFe) Crystallography

Axial Ratios:

a:b:c =1.6498:1:2.459

Cell Dimensions:

a = 16.3992, b = 9.94, c = 24.4434, Z = 4; beta = 105.489° V = 3,839.76 Den(Calc)= 3.57

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cc

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

By Intensity(I/I_o): 3.0093(1), 2.6847(0.699), 3.1925(0.412),2.737(0.278), 3.3784(0.262), 2.8047(0.24), 2.8202(0.235), 2.5291(0.23),

Crystal Structure:

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Camara F , Oberti R , Chopin C , Medenbach O , American Mineralogist , 91 (2006) p.1249-1259, The arrojadite enigma: I. A new formula and, a new model for the arrojadite structure, Sample: Horrsjoberg, Varmland, Sweden

Physical Properties of Arrojadite-(SrFe)

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Arrojadite-(SrFe)

Optical Data:

NCalc= 1.67 - from Gladstone-Dale relationship (KC = 0.1866) where Ncalc=Dcalc*KC+1

Calculated Properties of Arrojadite-(SrFe)

Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Arrojadite-(SrFe) =3.57 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Arrojadite-(SrFe)}= 23.70 barns/electron
U=PE_{Arrojadite-(SrFe)} x r_electron= 81.50 barns/cc.

Radioactivity:

GRapi = 0.78 (Gamma Ray American Petroleum Institute Units)
Concentration of Arrojadite-(SrFe) per GRapi unit =128.21 (%)

Estimated Radioactivity from Arrojadite-(SrFe) - barely detectable

Arrojadite-(SrFe) Classification

Dana Class:

41.07.02a.06 (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-(SrFe) Information

References:

NAME( AmMin, v91, p1266) PHYS. PROP.(AmMin, v91, p1249)

See Also:

Links to other databases for Arrojadite-(SrFe) :
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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Print or Cut-and-Paste your Arrojadite-(SrFe) Specimen Label here :

Arrojadite-(SrFe)

SrFe++Na2Ca(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Dana No: 41.07.02a.06 Strunz No: 08.BF.05
Locality:

Notes: