Dickinsonite Mineral Data

General Dickinsonite Information

Chemical Formula: KNa4Ca(Mn++,Fe++)14Al(PO4)12(OH)2 Composition: Molecular Weight = 2,132.64 gm    Potassium    0.92 %  K     1.10 % K₂O    Sodium       5.71 %  Na    7.70 % Na₂O    Lithium      0.07 %  Li    0.14 % Li₂O    Calcium      1.69 %  Ca    2.37 % CaO    Manganese   24.73 %  Mn   31.93 % MnO    Aluminum     1.01 %  Al    1.91 % Al₂O₃    Iron        10.21 %  Fe   13.14 % FeO    Phosphorus  17.14 %  P    39.27 % P₂O₅    Hydrogen     0.18 %  H     1.65 % H₂O    Oxygen      38.34 %  O               ______        ______                100.00 %       99.21 % = TOTAL OXIDE Empirical Formula: K_0.5Li_0.2Na_5.3Ca_0.9Mn²⁺_9.6Fe²⁺_3.9Al_0.8(PO₄)_11.8(OH)_3.9 Environment: High temperature (800 deg C) primary mineral in granite pegmatites. IMA Status: Discredited IMA 2005 - Dana # Changed from 41.7.2.2 Locality: Branchville, Fairfield County, Connecticut, USA. Link to MinDat.org Location Data. Name Origin: Named for Reverend John William Dickinson (1835-1899), Redding, Connecticut, USA, an early collector of Branchville minerals. Dickinsonite is now the group name. Name Pronunciation: Dickinsonite + Pronunciation Synonym: ICSD 100870   PDF 43-1466  

Dickinsonite Image

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Dickinsonite Crystallography

Axial Ratios: a:b:c =1.6783:1:2.4814 Cell Dimensions: a = 16.7, b = 9.95, c = 24.69, Z = 4; beta = 104.783° V = 3,966.81 Den(Calc)= 3.57 Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Cc X Ray Diffraction: By Intensity(I/I_o): 3.05(1), 2.72(0.9), 3.22(0.7), Forms:

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Forms: ( 1 0 2) ( 1 1 0) ( 1 0 2) ( 1 1 1) ( 1 0 0) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers.

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 BR

 

Physical Properties of Dickinsonite

Cleavage: {???} Perfect Color: Brownish green, Green, Yellow green. Density: 3.34 Diaphaneity: Transparent to Translucent Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments. Habit: Foliated - Two dimensional platy forms. Habit: Micaceous - Platy texture with "flexible" plates. Hardness: 3.5-4 - Copper Penny-Fluorite Luminescence: Non-fluorescent. Luster: Vitreous - Pearly Streak: white  

Optical Properties of Dickinsonite

Gladstone-Dale: CI meas= -0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1847,KPDmeas= 0.1974,KC= 0.1912
Ncalc = 1.64 - 1.68 Optical Data: Biaxial (+), a=1.648-1.658, b=1.655-1.662, g=1.662-1.671, bire=0.0130-0.0140, 2V(Calc)=68-88, 2V(Meas)=80-90. Dispersion relatively strong. Pleochroism (x): pale olive green. Pleochroism (y): paler olive green. Pleochroism (z): very pale yellow green.  

Calculated Properties of Dickinsonite

Electron Density: Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Dickinsonite =3.34 gm/cc.
Fermion Index: Fermion Index = 0.0024221687
Boson Index = 0.9975778313 Photoelectric: PE_Dickinsonite = 10.68 barns/electron
U=PE_Dickinsonite x r_electron= 34.38 barns/cc.
Radioactivity:

GRapi = 12.76 (Gamma Ray American Petroleum Institute Units)
Concentration of Dickinsonite per GRapi unit = 7.84 (%)

Estimated Radioactivity from Dickinsonite - barely detectable

 

Dickinsonite Classification

Dana Class: 41.07.02d.00 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen   (41.07)where (A B)m (XO4)4 Zq   (41.07.02d)Arrojadite Group (Ferri-arrojadite Subgroup) (Fe in Al site, OH in W site, Fe in M site)  

41.07.02d.00 Dickinsonite? KNa4Ca(Mn,Fe)14Al(PO4)12(OH)2 Cc m

 

41.07.02d.01 Dickinsonite-(KMnNa)! KNaMnNa3Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

 

41.07.02d.02 Dickinsonite-(KNaNa)! KNaNa4Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

 

41.07.02d.03 Dickinsonite-(KNa)! KNa4Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(OH,F)2 Cc m

 

41.07.02d.04 Dickinsonite-(NaNa)! Na2Na4Ca(Mn,Fe,Mg)13Al(PO4)11(PO4)(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 Dickinsonite Information

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