Kidwellite Mineral Data

Kidwellite Mineral Data +

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General Kidwellite Information

Chemical Formula:

Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O)

Composition:

Molecular Weight = 1,368.34 gm

Sodium 1.68 % Na 2.26 % Na₂O

Iron 36.73 % Fe 52.52 % Fe₂O₃

Copper 2.32 % Cu 2.91 % CuO

Phosphorus 13.58 % P 31.12 % P₂O₅

Hydrogen 1.25 % H 11.19 % H₂O

Oxygen 44.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaFe³⁺₉Cu_0.5(PO₄)₆(OH)₁₁·3(H₂O)

Environment:

Assoicated with other phosphates in novaculite deposits.

IMA Status:

Approved IMA 1978

Locality:

Coon Creek mine, Shady, Polk County, Arkansas, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Albert Laws Kidwell (1919-), Houston, Texas.

Kidwellite Image

Images:

Kidwellite Frondelite

Comments: Root beer colored crystals of frondelite and white kidwellite sticks on matrix.
Location: Sapucaia, Minas Gerais, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Kidwellite

Comments: Yellowish green columnar aggregates of kidwellite crystals.
Location: Indian Mountain, Cherokee County, Alabama, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Kidwellite Strengite

Comments: Spherical, crystalline aggregate of purple strengite on green kidwellite.
Location: Three Oak Gap, Polk Co., Arkansas, USA. Scale: Crystal size 2 mm.
© Tom Loomis / Dakota Matrix

Kidwellite Crystallography

Axial Ratios:

a:b:c =3.8798:1:2.6958

Cell Dimensions:

a = 20.117, b = 5.185, c = 13.978, Z = 2; beta = 107.07° V = 1,393.77 Den(Calc)= 3.26

Crystal System:

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

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

By Intensity(I/I_o): 9.41(1), 3.413(0.55), 3.813(0.4),

Physical Properties of Kidwellite

Cleavage:

[100] Perfect

Color:

Greenish yellow, Greenish white, Yellow, Light green.

Density:

3.04

Diaphaniety:

Translucent

Habit:

Columnar - Forms columns

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3 - Calcite

Luster:

Silky

Streak:

yellow

Optical Properties of Kidwellite

Gladstone-Dale:

CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.093 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2446,KPDmeas= 0.2623,KC= 0.2697

Optical Data:

Biaxial (-), a=1.787, b=1.8, g=1.805, bire=0.0180

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Kidwellite

Electron Density:

r_electron=2.98 gm/cc
note: r_Kidwellite=3.04 gm/cc.

Fermion Index

Fermion Index = 0.008
Boson Index = 0.992

Photoelectric:

PE_Kidwellite= 12.63 barns/electron
U=PE_Kidwellite x r_electron= 37.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kidwellite is Not Radioactive

Kidwellite Classification

Dana Class:

42.8.2.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.2)Dana Group

42.8.2.1 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

Strunz Class:

VII/D.11-140 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Kidwellite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin 89:1833) OPTIC PROP.(Dana8)

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Kidwellite

Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O)
Dana No: 42.8.2.1 Strunz No: VII/D.11-140
Locality:

Notes: