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Woodallite

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About WoodalliteHide

Formula:
Mg6Cr2(OH)16Cl2 · 4H2O
Colour:
Purple to deep magenta.
Lustre:
Resinous
Hardness:
1½ - 2
Crystal System:
Trigonal
Name:
Named in honor of Roy Woodall (3 November 1930, Perth, Western Australia, Australia - ), eminent Australian geologist who was instrumental in the initiation and development of the nickel and aluminium industries in Western Australia.
Hydrotalcite Group.

See also the visually similar stichtite.


Classification of WoodalliteHide

Approved
Approval Year:
2000
4.FL.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra

Physical Properties of WoodalliteHide

Resinous
Transparency:
Transparent
Colour:
Purple to deep magenta.
Streak:
Pale pink to white
Hardness:
1½ - 2 on Mohs scale

Optical Data of WoodalliteHide

Type:
Uniaxial (-)
RI values:
nω = 1.555 nε = 1.535
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of WoodalliteHide

Formula:
Mg6Cr2(OH)16Cl2 · 4H2O

Crystallography of WoodalliteHide

Crystal System:
Trigonal

Type Occurrence of WoodalliteHide

Synonyms of WoodalliteHide

Other Language Names for WoodalliteHide

German:Woodallit
Simplified Chinese:羟氯铬镁石
Spanish:Woodallita

Relationship of Woodallite to other SpeciesHide

Other Members of this group:
DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
DroninoiteNi6Fe2+3(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
Hydrotalcite-3RMg6Al2(CO3)(OH)16 · 4H2OTrig. 3m (3 2/m) : R3m
IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Iowaite1 photo of Woodallite associated with Iowaite on mindat.org.
Lizardite1 photo of Woodallite associated with Lizardite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.FL.TrébeurdeniteFe2+2Fe3+4O2(OH)10CO3·3H2OTrig. 3m (3 2/m) : R3m
4.FL.05IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m (3 2/m)
4.FL.05FougèriteFe2+4Fe3+2(OH)12[CO3]·3H2OTrig. 3m (3 2/m) : R3m
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2OMon. 2 : P21
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2OTrig.
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn4+3O7 · 3H2OTrig. 3 : R3
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.20ErnienickeliteNiMn3O7 · 3H2OTrig. 3 : R3
4.FL.20Jianshuiite(Mg,Mn,Ca)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.25WoodruffiteZn2+x/2(Mn4+1-xMn3+x)O2·yH2OMon. 2/m : B2/m
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2OHex.
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2OTrig. 3 : P3
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2OHex.
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2OMon. 2/m : B2/m
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2OMon. 2/m : B2/m
4.FL.60JenseniteCu3[TeO6] · 2H2OMon. 2/m : P21/m
4.FL.65LeisingiteCuMg2Te6+O6 · 6H2OTrig. 3 : P3
4.FL.70Akdalaite5Al2O3 · H2OHex.
4.FL.75CafetiteCaTi2O5 · H2OMon. 2/m : P21/b
4.FL.80MouriteUMo5O12(OH)10Mon.
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for WoodalliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Magazine (2001): 65: 427-435.
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for WoodalliteHide

Localities for WoodalliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Western Australia
    • Wiluna Shire
      • Lake Way Station
Grguric, B.A., Seat, Z., Karpuzov, A.A., Simonov, O.N. (2013) The West Jordan deposit, a newly-discovered Type 2 dunite-hosted nickel sulphide system in the northern Agnew-Wiluna Belt, Western Australia. Ore Geology Reviews, Vol. 51, pg. 79-92
      • Mount Keith
Mills, S. J., Wilson, S. A., Dipple, G. M. & Raudsepp, M. (2010) The decomposition of konyaite: Importance in CO2 in mine tailings. Mineralogical Magazine, 74(5), 903–917.
Mineral and/or Locality  
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