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

Images:

Dickinsonite

Comments: Salmon-colored, crystalline dickinsonite.
Location: Branchville, Fairfield County, Connecticut, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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 - Domatic H-M Symbol (m) Space Group: Cc

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

By Intensity(I/I_o): 3.05(1), 2.72(0.9), 3.22(0.7),

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Forms: ( 1 0 2) ( 1 1 0) ( 1 0 2) ( 1 1 1) ( 1 0 0) ( 0 0 1)

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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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Print or Cut-and-Paste your Dickinsonite Specimen Label here :

Dickinsonite

KNa4Ca(Mn++,Fe++)14Al(PO4)12(OH)2
Dana No: 41.07.02d.00 Strunz No: 08.BF.05
Locality:

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