Iowaite Mineral Data

Iowaite Mineral Data
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General Iowaite Information

Help on Chemical Formula: Chemical Formula: Mg4Fe+++(OH)8OCl•2-4(H2O)
Help on Composition: Composition: Molecular Weight = 394.62 gm
   Magnesium  24.64 %  Mg   40.85 % MgO
   Iron       14.15 %  Fe   20.23 % Fe2O3
   Hydrogen    3.58 %  H    31.96 % H2O
   Chlorine    8.98 %  Cl    8.98 % Cl
                -   %   Cl   -2.03 % -O=Cl2   
   Oxygen     48.65 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg4Fe3+(OH)8OCl•3(H2O)
Help on Environment: Environment: Veinlets in serpentinite.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Sioux County, Iowa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Iowaite Say IOWAITE
Help on Synonym: Synonym: ICSD 15202
  PDF 20-500
 

Iowaite Image

Click Here for Larger Iowaite Image in a New Browser Window Images:
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Iowaite

Comments: Floater crystal of iowaite.
Location: Palabora Mine, Transvaal, South Africa. Scale: Crystal size 1.2 cm.
© John Veevaert

Iowaite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:7.86149
Help on Cell Dimensions: Cell Dimensions: a = 3.119, c = 24.52, Z = 0.6; V = 206.58 Den(Calc)= 1.90
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.109(1), 4.047(0.4), 2.363(0.27),
Click Here for Large Iowaite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Allmann R , Donnay J D H , American Mineralogist , 54 (1969) p.296-299, About the structure of iowaite

View Additional jPOWD Structure files for Iowaite
[1]
 

Physical Properties of Iowaite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Bluish green, Greenish white, Honey yellow.
Help on Density: Density: 2.09 - 2.11, Average = 2.09
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 1.5 - Between Talc and Gypsum
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white
 

Optical Properties of Iowaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2868,KPDmeas= 0.2595,KC= 0.2825
Ncalc = 1.54 - 1.6
Help on Optical Data: Optical Data: Uniaxial (-), e=1.533-1.543, w=1.543-1.561, bire=0.0100-0.0180.
 

Calculated Properties of Iowaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.94 gm/cc
note: Specific Gravity of Iowaite =1.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEIowaite = 5.25 barns/electron
U=PEIowaite x rElectron Density= 10.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Iowaite is Not Radioactive
 

Iowaite Classification
Help on Dana Class: Dana Class: 06.04.05.01 (06)Hydroxides and Oxides Containing Hydroxyl
  (06.04)containing multiple cations
  (06.04.05)Dana Group
 
06.04.05.01 Iowaite Mg4Fe(OH)8OCl•2-4(H2O) R 3m 3 2/m
 
06.04.05.02 Woodallite! Mg6Cr2(OH)16Cl2•4(H2O) R 3m 3 2/m
Help on Strunz Class: Strunz Class: 04.FL.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FL -Hydroxides with H2O ± (OH); sheets of edge-sharing octahedra
 
04.FL.05 Akdalaite 5(Al2O3)•(H2O) P 63mc 6mm
 
04.FL.05 Meixnerite Mg6Al2(OH)18•4(H2O) R 3m 3 2/m
 
04.FL.05 Jamborite (Ni,Ni,Fe)(OH)2(OH,S,(H2O)) Unk Hex
 
04.FL.05 Iowaite Mg4Fe(OH)8OCl•2-4(H2O) R 3m 3 2/m
 
04.FL.05 Muskoxite Mg7Fe4O13•10(H2O) Unk (pseudo HEX-R) Trig
 
04.FL.05 Woodallite! Mg6Cr2(OH)16Cl2•4(H2O) R 3m 3 2/m
 

Other Iowaite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Iowaite :
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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Ask about Iowaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Iowaite

Mg4Fe+++(OH)8OCl•2-4(H2O)
Dana No: 06.04.05.01 Strunz No: 04.FL.05
Locality:

 

Notes: