Arrojadite-(KNa) Mineral Data

General Arrojadite-(KNa) Information

Chemical Formula:

KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2

Composition:

Molecular Weight = 2,033.01 gm

Potassium 1.60 % K 1.92 % K₂O

Sodium 5.67 % Na 7.64 % Na₂O

Strontium 0.04 % Sr 0.05 % SrO

Lithium 0.00 % Li 0.01 % Li₂O

Calcium 1.79 % Ca 2.51 % CaO

Magnesium 3.22 % Mg 5.33 % MgO

Titanium 0.05 % Ti 0.08 % TiO₂

Manganese 2.78 % Mn 3.59 % MnO

Aluminum 1.38 % Al 2.61 % Al₂O₃

Zinc 0.03 % Zn 0.04 % ZnO

Iron 25.66 % Fe 33.01 % FeO

Silicon 0.01 % Si 0.03 % SiO₂

Phosphorus 18.27 % P 41.86 % P₂O₅

Hydrogen 0.15 % H 1.32 % H₂O

Oxygen 39.33 % O

Fluorine 0.03 % F 0.03 % F

- % F -0.01 % -O=F₂

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

K_0.83Na_5.01Ca_0.91Sr_0.01Fe²⁺_9.34Mg_2.69Mn²⁺_1.03Zn_0.01Li_0.01Al_1.04Ti_0.02(OH)_1.97F_0.03 P_11.99Si_0.01O₄₇(OH)

Environment:

Occurs as coating of open fractures in siderite-rich Lower Cretaceous sandstones of the Rapid Creek area. Arrojadite group

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Rapid Creek, Yukon Territory, Canada Link to MinDat.org Location Data.

Name Origin:

Named after arrojadite and site occupancy of the arrojadite structure.

Name Pronunciation:

Arrojadite-(KNa) + Pronunciation

Synonym:

IMA2005-047

Arrojadite-(KNa) Image

Images:

Arrojadite-(KNa)

Comments: Brownish crystals of arrojadite-(KNa).
Location: Big Fish River, Dawson Mining District, Yukon Territory, Canada. Scale: Picture Size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Arrojadite-(KNa) Crystallography

Axial Ratios:

a:b:c =1.6435:1:2.4517

Cell Dimensions:

a = 16.522, b = 10.0529, c = 24.6477, Z = 4; beta = 106.509° V = 3,925.07 Den(Calc)= 3.44

Crystal System:

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

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

By Intensity(I/I_o): 3.0498(1), 2.6908(0.713), 5.8614(0.288),2.7933(0.28), 5.0264(0.275), 2.7979(0.249), 2.7774(0.244),

Crystal Structure:

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Help on Above

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: Rapid Creek, Yukon, Canada

Physical Properties of Arrojadite-(KNa)

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Arrojadite-(KNa)

Optical Data:

NCalc= 1.65 - from Gladstone-Dale relationship (KC = 0.1904) where Ncalc=Dcalc*KC+1

Calculated Properties of Arrojadite-(KNa)

Electron Density:

Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Arrojadite-(KNa) =3.44 gm/cc.

Fermion Index:

Fermion Index = 0.0089836476
Boson Index = 0.9910163524

Photoelectric:

PE_{Arrojadite-(KNa)}= 9.92 barns/electron
U=PE_{Arrojadite-(KNa)} x r_electron= 33.17 barns/cc.

Radioactivity:

GRapi = 22.39 (Gamma Ray American Petroleum Institute Units)
Concentration of Arrojadite-(KNa) per GRapi unit = 4.47 (%)

Estimated Radioactivity from Arrojadite-(KNa) - barely detectable

Arrojadite-(KNa) Classification

Dana Class:

41.07.02a.01 (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-(KNa) Information

References:

NAME( AmMin, v91,1249) PHYS. PROP.(AmMin, v91, p1249)

See Also:

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

Arrojadite-(KNa)

KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Dana No: 41.07.02a.01 Strunz No: 08.BF.05
Locality:

Notes: