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Motukoreaite

A valid IMA mineral species - questionable
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Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
Colour:
Colorless, white, yellow
Lustre:
Dull
Hardness:
1 - 1½
Specific Gravity:
1.48 - 1.53
Crystal System:
Trigonal
Member of:
Wermlandite Group >Hydrotalcite Supergroup
Name:
Named by K.A. Rodgers, J.E. Chisholm, R.J. Davis, and C.S. Nelson in 1977 for the Maori name of the type locality, Motukorea, meaning 'island of cormorants'.
Type Locality:
ⓘBrowns Island, Auckland Region, New Zealand
Partial dehydration readily occurs.

As part of the recent re-evaluation of the nomenclature of thehydrotalcite supergroup (Mills et al., 2012), motukoreaite was identified as a questionable species which needs further investigation. The range of composition currently ascribed to motukoreaite may represent more than one species.


Unique Identifiers
IMA Formula:
Mg6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O
First published:
1977
Type description reference:
Rodgers, K. A., Chisholm, J. E., Davis, R. J., Nelson, C. S. (1977) Motukoreaite, a new hydrated carbonate, sulphate, and hydroxide of Mg and Al from Auckland, New Zealand.Mineralogical Magazine, 41 (319) 389-390doi:10.1180/s0026461x00038147

Classification of Motukoreaite
Dana 8th ed.:
17.1.7.1

17 : COMPOUND CARBONATES
1 : Miscellaneous
Hey's CIM Ref.:
12.2.4

12 : Carbonates with other anions
2 : Carbonates with sulphate

Mineral Symbols
Transparency:
Translucent
Colour:
Colorless, white, yellow
Streak:
White
Hardness:
1 - 1½ onMohs scale
Density:
1.48 - 1.53 g/cm3 (Measured)    1.478 g/cm3 (Calculated)

Optical Data of Motukoreaite
Surface Relief:
Low

Chemistry of Motukoreaite

Chemical Analysis
General Appearance of Type Material:
White, clay-like. A box-work of plate-like crystals with a hexagonal form in which individuals measured about 3 × 3 × 0.02 microns.
Place of Conservation of Type Material:
University of Auckland, Auckland, New Zealand.
The Natural History Museum, London, England, 1977,422.
National Museum of Natural History, Washington, D.C., USA, 142971.
Geological Setting of Type Material:
Clay-like cement in both beach-rock and basaltic volcanic tuffs.
Reference:
Rodgers, K. A., Chisholm, J. E., Davis, R. J., Nelson, C. S. (1977) Motukoreaite, a new hydrated carbonate, sulphate, and hydroxide of Mg and Al from Auckland, New Zealand.Mineralogical Magazine, 41 (319) 389-390doi:10.1180/s0026461x00038147

Synonyms of Motukoreaite

Other Language Names for Motukoreaite

Relationship of Motukoreaite to other Species
Other Members of Wermlandite Group:
ErssoniteMg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2OTrig.3m(32/m) :P3c1
KarchevskyiteMg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5Trig.
NatroglaucoceriniteZn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OHex.
NikischeriteFe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.3 :R3
ShigaiteMn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.3 :R3
WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2OTrig.3m(32/m) :P3c1

Common AssociatesMon. 2/m :P21/b7.DD.05FelsőbányaiteAl4(SO4)(OH)10 · 4H2OMon. 2 :P217.DD.07LlantenesiteCu6Al[SeO4](OH)12Cl · 3H2OTrig. 3m :P31c7.DD.10LangiteCu4(SO4)(OH)6 · 2H2OMon.m7.DD.10FehriteMgCu4(SO4)2(OH)6 · 6H2OMon. 2/m :P21/b7.DD.10PosnjakiteCu4(SO4)(OH)6 · H2OMon.m :Pm7.DD.10WroewolfeiteCu4(SO4)(OH)6 · 2H2OMon.m :Pm7.DD.10GobeliniteCoCu4(SO4)2(OH)6 · 6H2OMon. 2/m :P21/m7.DD.15KobyasheviteCu5(SO4)2(OH)6 · 4H2OTric.1 :P17.DD.15SpangoliteCu6Al(SO4)(OH)12Cl · 3H2OTrig. 3m :P31c7.DD.15Unnamed (Dimorph of Devilline)CaCu4(SO4)2(OH)6 · 3H2OMon. 2/m :P21/b7.DD.20KtenasiteZnCu4(SO4)2(OH)6 · 6H2OMon. 2/m :P21/b7.DD.25ChristeliteCu2Zn3(SO4)2(OH)6 · 4H2OTric.1 :P17.DD.30EdwardsiteCu3Cd2(SO4)2(OH)6 · 4H2OMon. 2/m :P21/b7.DD.30NiedermayriteCdCu4(SO4)2(OH)6 · 4H2OMon. 2/m :P21/m7.DD.30SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2OMon. 2/m :B2/b7.DD.30CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2OMon. 2 :B27.DD.30OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2OOrth.mm2 :Pca217.DD.30DevillineCaCu4(SO4)2(OH)6 · 3H2OMon. 2/m :P21/b7.DD.35ShigaiteMn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.3 :R37.DD.35Zincaluminite(Zn1-xAlx)(SO4)x/2(OH)2 · nH2O7.DD.35ZincowoodwarditeZn1-xAlx(OH)2[SO4]x/2 · nH2OTrig.7.DD.35NatroglaucoceriniteZn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OHex.7.DD.35Hydrowoodwardite(Cu1-xAlx)(OH)2[SO4]x/2 · nH2OTrig.3m(32/m) :R3m7.DD.35Honessite(Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2OTrig.7.DD.35Carrboydite(Ni1-xAlx)(SO4)x/2(OH)2 · nH2OHex.7.DD.35Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2OHex.7.DD.35WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2OTrig.3m(32/m) :P3c17.DD.35NikischeriteFe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.3 :R37.DD.35Hydrohonessite(Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2OHex.7.DD.35WoodwarditeCu1-xAlx(OH)2(SO4)x/2 · nH2OTrig.3m(32/m) :R3m7.DD.35Mountkeithite[(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2OHex.7.DD.40Lawsonbauerite(Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2OMon. 2/m :P21/b7.DD.40Torreyite(Mg,Mn2+)7◻2Mn2+2Zn4(SO4)2(OH)22 · 8H2OMon. 2/m :P21/b7.DD.40IsseliteCu6(SO4)(OH)10(H2O)4 · H2OOrth.mm2 :Pmn217.DD.45MooreiteMg9◻2Mn2Zn4(SO4)2(OH)26 · 8H2OMon. 2/m :P2/b7.DD.45Hodgesmithite(Cu,Zn)6Zn(SO4)2(OH)10 · 3H2OTrig. 3 :P37.DD.47LahnsteiniteZn4(SO4)(OH)6 · 3H2OTric. 1 :P17.DD.50NamuwiteZn4(SO4)(OH)6 · 4H2OTrig.3 :P37.DD.50Minohlite(Cu,Zn)7(SO4)2(OH)10 · 8H2OHex.7.DD.52LauraniiteCu6Cd2(SO4)2(OH)12 · 5H2OMon. 2/m :P21/b7.DD.55BechereriteZn7Cu(OH)13[(SiO(OH)3(SO4)]Trig. 3 :P37.DD.60Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2OMon. 2/m7.DD.65VonbezingiteCa6Cu3(SO4)3(OH)12 · 2H2OMon. 2/m :P21/b7.DD.70RedgilliteCu6(SO4)(OH)10 · H2OMon. 2/m :P21/b7.DD.75NickelalumiteNiAl4(SO4)(OH)12(H2O)3Mon. 2/m7.DD.75KyrgyzstaniteZnAl4(SO4)(OH)12 · 3H2OMon. 2/m7.DD.75ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2OMon. 2 :P217.DD.80Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2OTrig. 37.DD.80UM1992-30-SO:CCuHZn(Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2OTrig. 3 :P37.DD.80ThérèsemagnaniteNaCo4(SO4)(OH)6Cl · 6H2OTrig.3 :P37.DD.80GuarinoiteZn6(SO4)(OH)10 · 5H2OHex.7.DD.85MontetrisaiteCu6(SO4)(OH)10 · 2H2OOrth.mm2 :Cmc21

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    • References for Motukoreaiteⓘ132 North Ni MineClissold (2007)
    Austria
     
    Alker et al. (1981)+3 other references
    Italy
     
    Daleffe et al. (2008)
    New Zealand (TL)
     
    Rodgers et al. (1977)
    Poland
     
    Wachowiak et al. (2016)
    Spain
     
    Van Opstal (2021)+2 other references
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