Arrojadite-(BaFe) Mineral Data

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General Arrojadite-(BaFe) Information

Chemical Formula:

(Ba,K,Pb)Na3(Ca,Sr)(Fe++,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2

Composition:

Molecular Weight = 2,242.07 gm

Potassium 0.17 % K 0.21 % K₂O

Barium 4.90 % Ba 5.47 % BaO

Sodium 3.08 % Na 4.15 % Na₂O

Strontium 0.78 % Sr 0.92 % SrO

Calcium 1.43 % Ca 2.00 % CaO

Magnesium 6.18 % Mg 10.25 % MgO

Manganese 0.49 % Mn 0.63 % MnO

Aluminum 1.20 % Al 2.27 % Al₂O₃

Iron 20.18 % Fe 25.96 % FeO

Phosphorus 16.58 % P 37.99 % P₂O₅

Hydrogen 0.09 % H 0.80 % H₂O

Lead 9.24 % Pb 9.96 % PbO

Oxygen 35.68 % O

______ ______

100.00 % 100.61 % = TOTAL OXIDE

Empirical Formula:

Na₃Ba_0.8K_0.1PbCa_0.8Sr_0.2Fe²⁺_8.1Mg_5.7Mn²⁺_0.2Al(PO₄)₁₂(OH)₂

Environment:

In a phengitic quartzite. The species name sigimundite is replaced by the name arrojadite-(BaFe)

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Near Madesimo, Spluga Valley, Central Alps, Italy. Link to MinDat.org Location Data.

Name Origin:

Originally for Pietro Sigismund (1874-1962), renamed arrojadite-(BaFe) in 2005 by the IMA.

Name Pronunciation:

Arrojadite-(BaFe) + Pronunciation

Synonym:

IMA1994-033

IMA2005 No 05-D

Sigismundite

Arrojadite-(BaFe) Image

Images:

Arrojadite-(BaFe)

Comments: Small grain of Arrojadite-(BaFe).
Location: Big Fish River, Yukon, Canada. Scale: Not Given.
© Sergey Vasiliev / Systematic Mineralogy

Arrojadite-(BaFe) Crystallography

Axial Ratios:

a:b:c =1.6506:1:2.4604

Cell Dimensions:

a = 16.394, b = 9.932, c = 24.437, Z = 4; beta = 105.78° V = 3,829.00 Den(Calc)= 3.89

Crystal System:

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

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

By Intensity(I/I_o): 3.01(1), 3.181(0.51), 2.678(0.42),

Crystal Structure:

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Demartin F , Gramaccioli C M , Pilati T , Sciesa E , The Canadian Mineralogist , 34 (1996) p.827-834, Sigismundite, (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12, a new, Ba-rich member of the arrojadite group from Spluga Valley, Italy, Locality: Spluga Valley, Italy

Physical Properties of Arrojadite-(BaFe)

Cleavage:

{???} Perfect

Color:

Grayish green.

Density:

3.54

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Arrojadite-(BaFe)

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1671,KPDmeas= 0.1836,KC= 0.1816
Ncalc = 1.64 - 1.71

Optical Data:

Biaxial (+/-), b=1.65

Calculated Properties of Arrojadite-(BaFe)

Electron Density:

Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Arrojadite-(BaFe) =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Arrojadite-(BaFe)}= 178.53 barns/electron
U=PE_{Arrojadite-(BaFe)} x r_electron= 600.02 barns/cc.

Radioactivity:

GRapi = 2.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Arrojadite-(BaFe) per GRapi unit = 41.73 (%)

Estimated Radioactivity from Arrojadite-(BaFe) - barely detectable

Arrojadite-(BaFe) Classification

Dana Class:

41.07.02a.05 (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-(BaFe) Information

References:

NAME( MinRec, Vol. 28, No. 3) PHYS. PROP.(Am.Min.,Vol.82,p432,1997) OPTIC PROP.(Am.Min.,Vol.82,p432,1997)

See Also:

Links to other databases for Arrojadite-(BaFe) :
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-(BaFe) Specimen Label here :

Arrojadite-(BaFe)

(Ba,K,Pb)Na3(Ca,Sr)(Fe++,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2
Dana No: 41.07.02a.05 Strunz No: 08.BF.05
Locality:

Notes: