Dickinsonite Mineral Data

Dickinsonite Mineral Data +

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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:

Valid Species (Pre-IMA) 1878

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.

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 - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

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

Forms:

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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

Diaphaniety:

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

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:

r_electron=3.22 gm/cc
note: r_Dickinsonite=3.34 gm/cc.

Fermion Index

Fermion Index = 0.00242
Boson Index = 0.99758

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)

Estimated Radioactivity from Dickinsonite - barely detectable

Dickinsonite Classification

Dana Class:

41.7.2.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.7)where (A B)m (XO4)4 Zq

(41.7.2)Dana Group

41.7.2.1 Arrojadite KNa4CaMn4Fe10Al(PO4)12(OH,F)2 C 2/c 2/m

41.7.2.2 Dickinsonite KNa4Ca(Mn,Fe)14Al(PO4)12(OH)2 C 2/c 2/m

Strunz Class:

VII/B.20-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.20 - Arrojadite - Samuelsonite series

VII/B.20-10 Arrojadite KNa4CaMn4Fe10Al(PO4)12(OH,F)2 C 2/c 2/m

VII/B.20-20 Dickinsonite KNa4Ca(Mn,Fe)14Al(PO4)12(OH)2 C 2/c 2/m

VII/B.20-25 Sigismundite! (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12 C 2/c 2/m

VII/B.20-30 Samuelsonite (Ca,Ba)Ca8(Fe,Mn)4Al2(PO4)10(OH)2 C 2/m 2/m

VII/B.20-40 Nabiasite! BaMn9[(V,As)O4]6(OH)2 P a3 2/m 3

Other Dickinsonite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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Dickinsonite

KNa4Ca(Mn++,Fe++)14Al(PO4)12(OH)2
Dana No: 41.7.2.2 Strunz No: VII/B.20-20
Locality:

Notes: