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Kidwellite Mineral Data

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General Kidwellite Information

Help on Chemical  Formula: Chemical Formula: Na(Fe+++,Cu)9+x(PO4)6(OH)11•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaFe3+9Cu0.5(PO4)6(OH)11•3(H2O)
Help on Environment: Environment: Assoicated with other phosphates in novaculite deposits.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Coon Creek mine, Shady, Polk County, Arkansas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Albert Laws Kidwell (1919-), Houston, Texas.
Help on Name Pronunciation: Name Pronunciation: Kidwellite + Pronunciation Say KIDWELLITE
 

Kidwellite Image

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  Frondelite   Kidwellite

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

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  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

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  Strengite   Kidwellite

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

Help on Axial Ratios: Axial Ratios: a:b:c =3.8798:1:2.6958
Help on Cell Dimensions: Cell Dimensions: a = 20.117, b = 5.185, c = 13.978, Z = 2; beta = 107.07° V = 1,393.77 Den(Calc)= 3.26
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.41(1), 3.413(0.55), 3.813(0.4),
 

Physical Properties of Kidwellite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Greenish yellow, Greenish white, Yellow, Light green.
Help on Density: Density: 3.04
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Silky
Help on Streak: Streak: yellow
 

Optical Properties of Kidwellite

Help on Gladstone-Dale: 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
Ncalc = 1.82 - 1.88
Help on Optical Data: Optical Data: Biaxial (-), a=1.787, b=1.8, g=1.805, bire=0.0180
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Kidwellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Kidwellite =3.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080023991
Boson Index = 0.9919976009
Help on Photoelectric: Photoelectric: PEKidwellite = 12.63 barns/electron
U=PEKidwellite x rElectron Density= 37.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kidwellite is Not Radioactive
 

Kidwellite Classification

Help on  Dana Class: Dana Class: 42.08.02.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.08)where (AB)7 (XO4)4 Zq ´┐Ż x(H2O)
  (42.08.02)Dana Group
 
42.08.02.01 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11•3(H2O) P 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.DK.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
 
08.DK.20 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11•3(H2O) P 2/c 2/m
 

Other Kidwellite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin 89:1833) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Kidwellite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
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

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

Kidwellite

Na(Fe+++,Cu)9+x(PO4)6(OH)11•3(H2O)
Dana No: 42.08.02.01 Strunz No: 08.DK.20
Locality:

 

Notes:

 

 
   
 


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