Arrojadite-(KFe) Mineral Data

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General Arrojadite-(KFe) Information

Chemical Formula:

KNa2CaNa2(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2

Composition:

Molecular Weight = 2,033.08 gm

Potassium 1.92 % K 2.32 % K₂O

Sodium 4.52 % Na 6.10 % Na₂O

Calcium 1.97 % Ca 2.76 % CaO

Magnesium 2.39 % Mg 3.96 % MgO

Manganese 10.81 % Mn 13.96 % MnO

Aluminum 1.33 % Al 2.51 % Al₂O₃

Iron 19.23 % Fe 24.74 % FeO

Phosphorus 18.28 % P 41.89 % P₂O₅

Hydrogen 0.12 % H 1.11 % H₂O

Oxygen 38.95 % O

Fluorine 0.47 % F 0.47 % F

- % F -0.20 % -O=F₂

______ ______

100.00 % 99.61 % = TOTAL OXIDE

Empirical Formula:

KNa₂CaNa₂Fe²⁺₇Mn²⁺₄Mg₂Al(PO₄)₁₁(PO₃OH)(OH)_1.5F_0.5

IMA Status:

Not Submitted IMA (Dana # Added)

Locality:

(Nickel Plate Mine), Serra Branca, Paraiba, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named after arrojadite and site occupancy of the arrojadite structure.

Name Pronunciation:

Arrojadite-(KFe) + Pronunciation

Arrojadite-(KFe) Image

Images:

Arrojadite-(KFe)

Comments: Greenish Gray, massive arrojadite-(KFe).
Location: Nickel Plate mine, Keystone District, Pennington County, South Dakota, USA. Scale: See Image.
© Rruff Database

Arrojadite-(KFe) Crystallography

Crystal System:

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

Crystal Structure:

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Moore P B , Araki T , Merlino S , Mellini M , Zanazzi P F , American Mineralogist , 66 (1981) p.1034-1049, The arrojadite-dickinsonite series, KNa4Ca(Fe,Mn)14Al(OH)2(PO4)12:, Crystal structure and crystal chemistry, sample NP, Locality: Nickel Plate mine, Keystone, South Dakota, USA

Optical Properties of Arrojadite-(KFe)

Optical Data:

Calculated Properties of Arrojadite-(KFe)

Fermion Index:

Fermion Index = 0.0066834548
Boson Index = 0.9933165452

Photoelectric:

PE_{Arrojadite-(KFe)}= 10.02 barns/electron
U=PE_{Arrojadite-(KFe)} x r_electron= . barns/cc.

Radioactivity:

GRapi = 26.90 (Gamma Ray American Petroleum Institute Units)
Concentration of Arrojadite-(KFe) per GRapi unit = 3.72 (%)

Estimated Radioactivity from Arrojadite-(KFe) - barely detectable

Arrojadite-(KFe) Classification

Dana Class:

41.07.02a.02 (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-(KFe) Information

References:

NAME( AmMin, v91, p1266)

See Also:

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

Arrojadite-(KFe)

KNa2CaNa2(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Dana No: 41.07.02a.02 Strunz No: 08.BF.05
Locality:

Notes: