Motukoreaite (original) (raw)

A valid IMA mineral species - questionable

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About MotukoreaiteHide

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Formula:

Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O

Colour:

Colorless, white, yellow

Specific Gravity:

1.48 - 1.53

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'.

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2793:5

4a02cac0-82a5-40c2-854e-7c625e635d90

IMA Classification of MotukoreaiteHide

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IMA Formula:

Mg6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O

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) 389-390 doi:10.1180/s0026461x00038147

Classification of MotukoreaiteHide

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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

17.1.7.1

17 : COMPOUND CARBONATES
1 : Miscellaneous

12.2.4

12 : Carbonates with other anions
2 : Carbonates with sulphate

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol Source Reference
Mtu IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Mtu Warr (2020) Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of MotukoreaiteHide

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Colour:

Colorless, white, yellow

Density:

1.48 - 1.53 g/cm3 (Measured) 1.478 g/cm3 (Calculated)

Optical Data of MotukoreaiteHide

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RI values:

_n_α = 1.510 _n_β = 1.510

δ = 1.510

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of MotukoreaiteHide

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Mindat Formula:

Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O

Chemical AnalysisHide

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Sample references:

ID Locality Reference Notes
1 Motukoreaite occurrence, Hoyo Azul, Playa Blanca, Yaiza, Lanzarote, Las Palmas Province, Canary Islands, Spain Dillen, Rik, Van Opstal, Simon, Mestrom, Paul (2021) Een nieuwigheid voor Lanzarote: motukoreaiet. Geonieuws: 46(4): 93-96 (in Dutch). average of 2 semiquantitative point analyses performed by Joy Desor.

Crystallography of MotukoreaiteHide

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Class (H-M):

3_m_ _(_32/m ) - Hexagonal Scalenohedral

Cell Parameters:

a = 9.172(2) Å, c = 33.51(1) Å

Unit Cell V:

2,441.37 ų (Calculated from Unit Cell)

Crystal StructureHide

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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 DiffractionHide

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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)

Geological EnvironmentHide

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Type Occurrence of MotukoreaiteHide

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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: 389–390.

Synonyms of MotukoreaiteHide

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Other Language Names for MotukoreaiteHide

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Relationship of Motukoreaite to other SpeciesHide

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Other Members of this group:

Erssonite Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O Trig. 3_m_ _(_32/m ) : _P_3_c_1
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. 3 : _R_3
Shigaite Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O Trig. 3 : _R_3
Wermlandite Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O Trig. 3_m_ _(_32/m ) : _P_3_c_1

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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7.DD. Asagiite NiCu4(SO4)2(OH)6 · 6H2O Mon. 2/m : _P_21/b
7.DD.05 Felsőbányaite Al4(SO4)(OH)10 · 4H2O Mon. 2 : _P_21
7.DD.07 Llantenesite Cu6Al[SeO4](OH)12Cl · 3H2O Trig. 3_m_ : P_31_c
7.DD.10 Langite Cu4(SO4)(OH)6 · 2H2O Mon. m
7.DD.10 Posnjakite Cu4(SO4)(OH)6 · H2O Mon. m : P m
7.DD.10 Wroewolfeite Cu4(SO4)(OH)6 · 2H2O Mon. m : P m
7.DD.10 Gobelinite CoCu4(SO4)2(OH)6 · 6H2O Mon. 2/m : _P_21/m
7.DD.10 Fehrite MgCu4(SO4)2(OH)6 · 6H2O Mon. 2/m : _P_21/b
7.DD.15 Spangolite Cu6Al(SO4)(OH)12Cl · 3H2O Trig. 3_m_ : P_31_c
7.DD.15 Kobyashevite Cu5(SO4)2(OH)6 · 4H2O Tric. 1 : _P_1
7.DD.15 Unnamed (Dimorph of Devilline) CaCu4(SO4)2(OH)6 · 3H2O Mon. 2/m : _P_21/b
7.DD.20 Ktenasite ZnCu4(SO4)2(OH)6 · 6H2O Mon. 2/m : _P_21/b
7.DD.25 Christelite Cu2Zn3(SO4)2(OH)6 · 4H2O Tric. 1 : _P_1
7.DD.30 Campigliaite Mn2+Cu4(SO4)2(OH)6 · 4H2O Mon. 2 : _B_2
7.DD.30 Devilline CaCu4(SO4)2(OH)6 · 3H2O Mon. 2/m : _P_21/b
7.DD.30 Orthoserpierite Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O Orth. m _m_2 : P c _a_21
7.DD.30 Serpierite Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O Mon. 2/m : _B_2/b
7.DD.30 Niedermayrite CdCu4(SO4)2(OH)6 · 4H2O Mon. 2/m : _P_21/m
7.DD.30 Edwardsite Cu3Cd2(SO4)2(OH)6 · 4H2O Mon. 2/m : _P_21/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. 3 : _R_3
7.DD.35 Wermlandite Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O Trig. 3_m_ _(_32/m ) : _P_3_c_1
7.DD.35 Woodwardite Cu1-xAlx(OH)2(SO4)x/2 · nH2O Trig. 3_m_ _(_32/m ) : R_3_m
7.DD.35 Zincaluminite (Zn1-xAlx)(SO4)x/2(OH)2 · nH2O
7.DD.35 Hydrowoodwardite (Cu1-xAlx)(OH)2[SO4]x/2 · nH2O Trig. 3_m_ _(_32/m ) : R_3_m
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. 3 : _R_3
7.DD.40 Isselite Cu6(SO4)(OH)10 · 5H2O Orth. m _m_2 : P m _n_21
7.DD.40 Lawsonbauerite (Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O Mon. 2/m : _P_21/b
7.DD.40 Torreyite (Mg,Mn2+)7◻2Mn2+2Zn4(SO4)2(OH)22 · 8H2O Mon. 2/m : _P_21/b
7.DD.45 Mooreite Mg9◻2Mn2Zn4(SO4)2(OH)26 · 8H2O Mon. 2/m : _P_2/b
7.DD.45 Hodgesmithite (Cu,Zn)6Zn(SO4)2(OH)10 · 3H2O Trig. 3 : _P_3
7.DD.47 Lahnsteinite Zn4(SO4)(OH)6 · 3H2O Tric. 1 : _P_1
7.DD.50 Namuwite Zn4(SO4)(OH)6 · 4H2O Trig. 3 : _P_3
7.DD.50 Minohlite (Cu,Zn)7(SO4)2(OH)10 · 8H2O Hex.
7.DD.52 Lauraniite Cu6Cd2(SO4)2(OH)12 · 5H2O Mon. 2/m : _P_21/b
7.DD.55 Bechererite Zn7Cu(OH)13[(SiO(OH)3(SO4)] Trig. 3 : _P_3
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 : _P_21/b
7.DD.70 Redgillite Cu6(SO4)(OH)10 · H2O Mon. 2/m : _P_21/b
7.DD.75 Chalcoalumite CuAl4(SO4)(OH)12 · 3H2O Mon. 2 : _P_21
7.DD.75 Nickelalumite NiAl4(SO4)(OH)12(H2O)3 Mon. 2/m
7.DD.75 Kyrgyzstanite ZnAl4(SO4)(OH)12 · 3H2O Mon. 2/m
7.DD.80 Guarinoite Zn6(SO4)(OH)10 · 5H2O Hex.
7.DD.80 Schulenbergite (Cu,Zn)7(SO4)2(OH)10 · 3H2O Trig. 3
7.DD.80 Thérèsemagnanite NaCo4(SO4)(OH)6Cl · 6H2O Trig. 3 : _P_3
7.DD.80 UM1992-30-SO:CCuHZn (Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O Trig. 3 : _P_3
7.DD.85 Montetrisaite Cu6(SO4)(OH)10 · 2H2O Orth. m _m_2 : C m _c_21

Other InformationHide

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Health Risks:

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

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References for MotukoreaiteHide

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Reference List:

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) 389-390 doi:10.1180/s0026461x00038147

Hawthorne, Frank C., Jambor, John L., Bladh, Kenneth W., Burke, Ernst A. J., Grice, Joel D., Phillips, Don, Roberts, Andrew C., Schedler, Robert A., E., James (1987) New mineral names. American Mineralogist, 72 (9-10) 1023-1028

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., Génin, J.-M. R., Kameda, T., Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76 (5) 1289-1336 doi:10.1180/minmag.2012.076.5.10

Localities for MotukoreaiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Australia
Western Australia Coolgardie Shire Widgiemooltha ⓘ 132 North Ni Mine Clissold (2007)
Austria
Styria Südoststeiermark District Bad Gleichenberg Wilhelmsdorf ⓘ Stradner Kogel Alker et al. (1981) +3 other references
Italy
Veneto Vicenza Province Crespadoro Chiampo Valley ⓘ "La Piatta" Quarry Daleffe et al. (2008)
New Zealand (TL)
Auckland Region ⓘ Browns Island (TL) Rodgers et al. (1977)
Poland
Greater Poland Voivodeship Koło County Gmina Kłodawa ⓘ Kłodawa salt deposit Wachowiak et al. (2016)
Spain
Canary Islands Las Palmas Province Lanzarote Yaiza Playa Blanca Hoyo Azul ⓘ Motukoreaite occurrence Van Opstal (2021) +2 other references