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Arrojadite Mineral Data

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General Arrojadite Information

Help on Chemical  Formula: Chemical Formula: KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2
Help on Composition: Composition: Molecular Weight = 2,151.01 gm
   Potassium    1.82 %  K     2.19 % K2O
   Sodium       4.28 %  Na    5.76 % Na2O
   Calcium      1.86 %  Ca    2.61 % CaO
   Manganese   10.22 %  Mn   13.19 % MnO
   Aluminum     1.25 %  Al    2.37 % Al2O3
   Iron        25.96 %  Fe   33.40 % FeO
   Phosphorus  17.28 %  P    39.59 % P2O5
   Hydrogen     0.07 %  H     0.63 % H2O
   Oxygen      36.82 %  O
   Fluorine     0.44 %  F     0.44 % F
                 -   %   F    -0.19 % -O=F2    
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KNa4CaMn2+4Fe2+10Al(PO4)12(OH)1.5F0.5
Help on Environment: Environment: Occurs at a high temperature (approx. 800 degrees C) primary mineral in granite pegmatites. Now is the series name.
Help on IMA Status: IMA Status: Renamed IMA 2005, Dana # changed from 41.7.2.1
Help on Locality: Locality: In Brazil, from the Sierra Branca pegmatite, 13 km south of Pedra Lavrada, Picui, Paraiba; in the Enio pegmatite mine, northeast of Galileia, and the Sapucaia pegmatite mine, about 50 Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Miguel Arrojado Ribeiro Lisboa (1872-1932), Brazilian geologist. Arrojadite {1925) is renamed arrojadite-(KFe) and arrojadite becomes the group name.
Help on Name Pronunciation: Name Pronunciation: Arrojadite + Pronunciation Say ARROJADITE
Help on Synonym: Synonym: ICSD 100872
  PDF 34-149
 

Arrojadite Image

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  Arrojadite

Comments: Brownish to clear crystals of arrojadite on matrix.
Location: Big Fish river area, Yukon Territory, Canada. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

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  Arrojadite

Comments: Tabular, diamond shaped golden yellow crystal of arrojadite.
Location: Rapid Creek, Yukon, Canada. Scale: Crystal to 5mm..
© Tom Loomis / Dakota Matrix

Arrojadite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6444:1:2.4612
Help on Cell Dimensions: Cell Dimensions: a = 16.537, b = 10.056, c = 24.75, Z = 4; beta = 105.65° V = 3,963.24 Den(Calc)= 3.60
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.042(1), 2.714(0.85), 3.222(0.45),
 

Physical Properties of Arrojadite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: Olive green, Clove brown, Yellow.
Help on Density: Density: 3.56
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: green gray
 

Optical Properties of Arrojadite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.186,KPDmeas= 0.1881,KC= 0.1892
Ncalc = 1.67 - 1.68
Help on Optical Data: Optical Data: Biaxial (+), a=1.664, b=1.67, g=1.675, bire=0.0110, 2V(Calc)=84, 2V(Meas)=86.
 

Calculated Properties of Arrojadite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Arrojadite =3.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0057083688
Boson Index = 0.9942916312
Help on Photoelectric: Photoelectric: PEArrojadite = 11.79 barns/electron
U=PEArrojadite x relectron= 40.52 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 25.32 (Gamma Ray American Petroleum Institute Units)
Concentration of Arrojadite per GRapi unit = 3.95 (%)

Estimated Radioactivity from Arrojadite - barely detectable

 

Arrojadite Classification

Help on  Dana Class: Dana Class: 41.07.02a.00 (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
Help on  Strunz Class: 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 Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Arrojadite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Arrojadite

KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2
Dana No: 41.07.02a.00 Strunz No: 08.BF.05
Locality:

 

Notes:

 

 
   
 


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