Motukoreaite
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About Motukoreaite
Formula:
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:
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:
Partial dehydration readily occurs.
As part of the recent re-evaluation of the nomenclature of the hydrotalcite 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.
As part of the recent re-evaluation of the nomenclature of the hydrotalcite 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.
Classification of Motukoreaite
Approved, Questionable
First published:
1977
6/D.14-20
7.DD.35
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
17.1.7.1
17 : COMPOUND CARBONATES
1 : Miscellaneous
17 : COMPOUND CARBONATES
1 : Miscellaneous
12.2.4
12 : Carbonates with other anions
2 : Carbonates with sulphate
12 : Carbonates with other anions
2 : Carbonates with sulphate
Physical Properties of Motukoreaite
Dull
Transparency:
Translucent
Colour:
colorless, white, yellow
Hardness:
1 - 1½ on Mohs scale
Density:
1.48 - 1.53 g/cm3 (Measured) 1.478 g/cm3 (Calculated)
Optical Data of Motukoreaite
Type:
Uniaxial
RI values:
nα = 1.510 nβ = 1.510
Max Birefringence:
δ = 1.510

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemical Properties of Motukoreaite
Formula:
Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
IMA Formula:
Mg6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O
Crystallography of Motukoreaite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 9.172(2) Å, c = 33.51(1) Å
Ratio:
a:c = 1 : 3.654
Unit Cell V:
2,441.37 ų (Calculated from Unit Cell)
Z:
3
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014801 | Motukoreaite | Rius J, Plana F (1986) Contribution to the superstructure resolution of the double layer mineral motukoreaite Neues Jahrbuch fur Mineralogie, Monatshefte 1986 263-272 | 1986 | the Emile Baudot bank, western Mediterranean | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
11.32 Å | (vvs) |
5.58 Å | (s) |
4.59 Å | (s) |
3.72 Å | (s) |
2.578 Å | (s) |
2.386 Å | (s) |
2.158 Å | (s) |
Type Occurrence of Motukoreaite
Synonyms of Motukoreaite
Other Language Names for Motukoreaite
Relationship of Motukoreaite to other Species
Member of:
Other Members of this group:
Karchevskyite | Mg18Al9(OH)54Sr2(CO3)9(H2O)6 (H3O)5 | Trig. |
Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Hex. |
Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. |
Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. |
Wermlandite | Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O | Trig. 3m (3 2/m) : P3c1 |
Common Associates
Associated Minerals Based on Photo Data:
12 photos of Motukoreaite associated with Phillipsite subgroup | |
7 photos of Motukoreaite associated with Calcite | CaCO3 |
5 photos of Motukoreaite associated with Phillipsite-K | (K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O |
3 photos of Motukoreaite associated with Gismondine | |
2 photos of Motukoreaite associated with Hannebachite | CaSO3 · H2O |
Related Minerals - Nickel-Strunz Grouping
7.DD.05 | Felsőbányaite | Al4(SO4)(OH)10 · 4H2O | Mon. 2 : P21 |
7.DD.10 | Langite | Cu4(SO4)(OH)6 · 2H2O | Mon. m |
7.DD.10 | Posnjakite | Cu4(SO4)(OH)6 · H2O | Mon. m : Pm |
7.DD.10 | Wroewolfeite | Cu4(SO4)(OH)6 · 2H2O | Mon. m : Pm |
7.DD.15 | Spangolite | Cu6Al(SO4)(OH)12Cl · 3H2O | Trig. 3m : P3 1c |
7.DD.20 | Ktenasite | ZnCu4(SO4)2(OH)6 · 6H2O | Mon. |
7.DD.25 | Christelite | Cu2Zn3(SO4)2(OH)6 · 4H2O | Tric. |
7.DD.30 | Campigliaite | Mn2+Cu4(SO4)2(OH)6 · 4H2O | Mon. |
7.DD.30 | Devilline | CaCu4(SO4)2(OH)6 · 3H2O | Mon. 2/m : P21/b |
7.DD.30 | Orthoserpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O | Orth. mm2 : Pca21 |
7.DD.30 | Serpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O | Mon. 2/m : B2/b |
7.DD.30 | Niedermayrite | CdCu4(SO4)2(OH)6 · 4H2O | Mon. 2/m : P21/m |
7.DD.30 | Edwardsite | Cu3Cd2(SO4)2(OH)6 · 4H2O | Mon. 2/m : P21/b |
7.DD.35 | Carrboydite | (Ni1-xAlx)(SO4)x/2(OH)2 · nH2O | Hex. |
7.DD.35 | Glaucocerinite | (Zn1-xAlx)(OH)2(SO4)x/2 · nH2O | Hex. |
7.DD.35 | Honessite | (Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O | Trig. |
7.DD.35 | Hydrohonessite | (Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2O | Hex. |
7.DD.35 | Mountkeithite | [(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O | Hex. |
7.DD.35 | Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. |
7.DD.35 | Wermlandite | Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O | Trig. 3m (3 2/m) : P3c1 |
7.DD.35 | Woodwardite | Cu1-xAlx(OH)2(SO4)x/2 · nH2O | Trig. 3m (3 2/m) : R3m |
7.DD.35 | Zincaluminite | Zn6Al6(SO4)2(OH)16 · 5H2O | |
7.DD.35 | Hydrowoodwardite | (Cu1-xAlx)(OH)2[SO4]x/2 · nH2O | Trig. 3m (3 2/m) : R3m |
7.DD.35 | Zincowoodwardite | Zn1-xAlx(OH)2[SO4]x/2 · nH2O | Trig. |
7.DD.35 | Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Hex. |
7.DD.35 | Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. |
7.DD.40 | Lawsonbauerite | (Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O | Mon. 2/m : P21/b |
7.DD.40 | Torreyite | (Mg,Mn2+)7◻2Mn2+2Zn4(SO4)2(OH)22 · 8H2O | Mon. 2/m : P21/b |
7.DD.45 | Mooreite | Mg9◻2Mn2Zn4(SO4)2(OH)26 · 8H2O | Mon. 2/m : P2/b |
7.DD.50 | Namuwite | Zn4(SO4)(OH)6 · 4H2O | Trig. 3 : P3 |
7.DD.55 | Bechererite | Zn7Cu(OH)13[(SiO(OH)3(SO4)] | Trig. 3 : P3 |
7.DD.60 | Ramsbeckite | (Cu,Zn)15(SO4)4(OH)22 · 6H2O | Mon. 2/m |
7.DD.65 | Vonbezingite | Ca6Cu3(SO4)3(OH)12 · 2H2O | Mon. 2/m : P21/b |
7.DD.70 | Redgillite | Cu6(SO4)(OH)10 · H2O | Mon. 2/m : P21/b |
7.DD.75 | Chalcoalumite | CuAl4(SO4)(OH)12 · 3H2O | Mon. 2 : P21 |
7.DD.75 | Nickelalumite | (Ni,Cu)Al4(SO4,(NO3)2)(OH)12 · 3H2O | Mon. |
7.DD.75 | Kyrgyzstanite | ZnAl4(SO4)(OH)12 · 3H2O | Mon. |
7.DD.80 | Guarinoite | Zn6(SO4)(OH)10 · 5H2O | Hex. |
7.DD.80 | Schulenbergite | (Cu,Zn)7(SO4)2(OH)10 · 3H2O | Trig. |
7.DD.80 | Thérèsemagnanite | NaCo4(SO4)(OH)6Cl · 6H2O | Trig. 3 : P3 |
7.DD.80 | UM1992-30-SO:CCuHZn | (Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O | Trig. 3 : P3 |
7.DD.85 | Montetrisaite | Cu6(SO4)(OH)10 · 2H2O | Orth. mm2 : Cmc21 |
Related Minerals - Hey's Chemical Index of Minerals Grouping
12.2.1 | Burkeite | Na6(CO3)(SO4)2 | Orth. |
12.2.2 | Hanksite | Na22K(SO4)9(CO3)2Cl | Hex. 6/m : P63/m |
12.2.3 | Tychite | Na6Mg2(CO3)4(SO4) | Iso. m3 (2/m 3) : Fd3 |
12.2.5 | Ferrotychite | Na6(Fe,Mn,Mg)2(CO3)4(SO4) | Iso. m3 (2/m 3) : Fd3 |
12.2.6 | Nakauriite | Cu8(SO4)4(CO3)(OH)6 · 48H2O | Orth. |
12.2.7 | Carbonatecyanotrichite | Cu4Al2(CO3,SO4)(OH)12 · 2H2O | Orth. |
12.2.8 | Rapidcreekite | Ca2(SO4)(CO3) · 4H2O | Orth. |
12.2.9 | Tatarskite | Ca6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O | Orth. |
12.2.10 | Schulenbergite | (Cu,Zn)7(SO4)2(OH)10 · 3H2O | Trig. |
12.2.11 | Leadhillite | Pb4(CO3)2(SO4)(OH)2 | Mon. 2/m : P21/b |
12.2.12 | Macphersonite | Pb4(CO3)2(SO4)(OH)2 | Orth. mmm (2/m 2/m 2/m) |
12.2.13 | Susannite | Pb4(CO3)2(SO4)(OH)2 | Trig. 3 : P3 |
12.2.14 | Wherryite | Pb7Cu2(SO4)4(SiO4)2(OH)2 | Mon. 2/m : B2/m |
12.2.15 | Caledonite | Pb5Cu2(SO4)3(CO3)(OH)6 | Orth. mm2 : Pmn21 |
12.2.16 | Nasledovite | PbMn3Al4(CO3)4(SO4)O5 · 5H2O | |
12.2.17 | Jouravskite | Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O | Hex. 6 : P63 |
12.2.18 | Schröckingerite | NaCa3(UO2)(CO3)3(SO4)F · 10H2O | Tric. 1 : P1 |
12.2.19 | Manganotychite | Na6Mn2(CO3)4(SO4) | Iso. m3 (2/m 3) : Fd3 |
12.2.20 | Hauckite | Fe3+3(Mg,Mn2+)24Zn18(SO4)4(CO3)2(OH)81 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
12.2.21 | Paraotwayite | Ni(OH)2-x(SO4,CO3)0.5x | Mon. |
12.2.22 | Carrboydite | (Ni1-xAlx)(SO4)x/2(OH)2 · nH2O | Hex. |
12.2.23 | Mountkeithite | [(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O | Hex. |
12.2.24 | Camérolaite | Cu6Al3(OH)18(H2O)2[Sb(OH)6](SO4) | Tric. 1 : P1 |
Other Information
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 Motukoreaite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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: 389–390.
Fleischer, M., Cabri, L.J. (1978) New mineral names. American Mineralogist: 63: 598-600.
Rius, J., Plana, F. (1986) Contribution to the superstructure resolution of the double layer mineral motukoreaite. Neues Jahrbuch für Mineralogie, Monatshefte: 263–272.
Hawthorne, F.C., Jambor, J.L., Bladh, K.W., Burke, E.A.J., Grice, J.D., Phillips, D., Roberts, A.C., Schedler, R.A., Shigley, J.E. (1987) New mineral names. American Mineralogist: 72: 1023-1028.
Zamarreño, I., Plana, F., Vazquez, A., Clague, D.A. (1989) Motukoreaite: a common alteration product in submarine basalts. American Mineralogist: 74: 1054–1058.
Bryner, V., Rodgers, K.A., Courtney, S.F., Postl, W. (1991) Motukoreaite from Brown’s Island, New Zealand, and Stradner Kogel, Austria: a scanning electron microscope study. Neues Jahrbuch für Mineralogie, Abh.: 163: 291–304.
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.
Wachowiak, J., Pieczka, A. (2016) Motukoreaite from the Kłodawa Salt Dome, Central Poland. Mineralogical Magazine: 80: 277-289.
Internet Links for Motukoreaite
mindat.org URL:
https://www.mindat.org/min-2793.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Motukoreaite
Locality List




All localities listed without proper references should be considered as questionable.
Australia | |
| Clissold, M. E. (2007) Aspects of the Supergene Geochemistry of Copper, Nickel and Bismuth. PhD Thesis University of Sydney, Australia 162pp. |
Austria | |
| Alker, A., Golob, P., Postl, W. & Waltinger, H. (1981): Hydrotalkit, Nordstrandit und Motukoreait vom Stradner Kogel, südlich Gleichenberg, Steiermark. Mitt.-Bl. Abt. Mineral. Landesmuseum Joanneum 49, 1-13.; Bryner, V., Rodgers, K.A., Courtney, S.F. and W. Postl (1991): Motukoreaite from Brown´s Island, New Zealand, and Stradner Kogel, Austria: a scanning electron microscopic study. N. Jahrb. Mineral. Abh., 163, 291-304.; R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993); Postl, W. et al. (2008) |
Italy | |
| Daleffe, A., & Boscardin, M. (2008): Motukoreaite. Primo ritrovamento in Italia. Rivista Mineralogica Italiana, 1/2008, 22-23 |
New Zealand (TL) | |
| 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, Vol 41: 319, 389-390. |
Poland | |
| Wachowiak, J., Pieczka, A. (2016): Motukoreaite from the Kłodawa Salt Dome, Central Poland. Mineralogical Magazine: 80: 277-289 |
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Stradner Kogel, Wilhelmsdorf, Bad Gleichenberg, Südoststeiermark District, Styria, Austria