Mineralogy Database

Woodallite Mineral Data

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General Woodallite Information

Help on Chemical  Formula: Chemical Formula: Mg6Cr2(OH)16Cl2•4(H2O)
Help on Composition: Composition: Molecular Weight = 659.31 gm
   Magnesium  22.86 %  Mg   37.90 % MgO
   Aluminum    0.82 %  Al    1.55 % Al2O3
   Chromium    9.46 %  Cr   13.83 % Cr2O3
   Iron        4.24 %  Fe    6.06 % Fe2O3
   Hydrogen    3.67 %  H    32.79 % H2O
   Carbon      0.36 %  C     1.34 % CO2
   Chlorine    8.60 %  Cl    8.60 % Cl
                -   %   Cl   -1.94 % -O=Cl2   
   Oxygen     49.99 %  O
             ______        ______ 
             100.00 %      100.12 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6.2Cr1.2Fe3+0.5Al0.2(OH)16Cl1.6(CO3)0.2�4(H2O)
Help on Environment: Environment: Altered dunite associated with Cr minerals.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Mount Keith nickel deposit, 90 km NNE of Leinster, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Roy Woodall (1930-), Australian geologist.
Help on Synonym: Synonym: IMA2000-042

Woodallite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.77022
Help on Cell Dimensions: Cell Dimensions: a = 3.103, c = 24.111, Z = 0.375; V = 201.05 Den(Calc)= 2.04
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.04(1)(003), 2.0072(0.6)(0.1.12), 4.0205(0.48)(006),2.624(0.3), 2.3488(0.05)(015),

Physical Properties of Woodallite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Deep magenta, Purple.
Help on Density: Density: 2.062
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Resinous - Waxy
Help on Streak: Streak: pale pinkish white

Optical Properties of Woodallite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2672,KPDmeas= 0.2643,KC= 0.2797
Ncalc = 1.57 - 1.58
Help on Optical Data: Optical Data: Uniaxial (-), e=1.535, w=1.555, bire=0.0200.

Calculated Properties of Woodallite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Woodallite =2.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEWoodallite = 4.40 barns/electron
U=PEWoodallite x rElectron Density= 9.15 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Woodallite is Not Radioactive

Woodallite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.04)containing multiple cations
  (06.04.05)Dana Group Iowaite Mg4Fe(OH)8OCl•2-4(H2O) R 3m 3 2/m 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 Woodallite Information

Help on References: References: NAME( AmMin, Vol 87, p 182) PHYS. PROP.(AmMin, Vol 87, p 182) OPTIC PROP.(AmMin, Vol 87, p 182)
Help on See Also: See Also: Links to other databases for Woodallite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 04.FL.05





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