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Browns Island (Motukorea), Auckland Region, North Island, New Zealand

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Latitude & Longitude (WGS84): 36° 49' 57'' South , 174° 53' 39'' East
Latitude & Longitude (decimal): -36.83258,174.89432
GeoHash:G#: rckq7yf4t
Locality type:Island
Köppen climate type:Cfb : Temperate oceanic climate


Eroded lava and scoria cone.

Type locality for Motukoreaite, named for the Maori word for the island meaning 'island of cormorants'.

The species was first noticed in 1941, but only as limestone. It was later in 1977 identified as a new species, on the island forming an off-white to pale yellow cement. It is relatively abundant at the location cementing alkali-olivine pebbles and granules, olivine sand, gravel sized bioclasts, quartz, feldspar, and sedimentary rock fragments. At a microscopic level the cement is composed of hexagonal plate like crystals in a boxwork.

The species is found at a few other places worldwide, although there is some doubt all of this is Motukoreaite due to the variety in the composition.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Basalt'
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, Vol 41: 319, 389-390.
Calcite
Formula: CaCO3
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, Vol 41: 319, 389-390.
'Fayalite-Forsterite Series'
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, Vol 41: 319, 389-390.
'Feldspar Group'
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, Vol 41: 319, 389-390.
'Limonite'
Formula: (Fe,O,OH,H2O)
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, Vol 41: 319, 389-390.
Motukoreaite (TL)
Formula: Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
Description: Cement for rock.
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, Vol 41: 319, 389-390.
Quartz
Formula: SiO2
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, Vol 41: 319, 389-390.
'Tuff'
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, Vol 41: 319, 389-390.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Motukoreaite' (TL)7.DD.35Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
Unclassified Minerals, Rocks, etc.
'Basalt'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
'Limonite'-(Fe,O,OH,H2O)
'Tuff'-

List of minerals arranged by Dana 8th Edition classification

Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 17 - COMPOUND CARBONATES
Miscellaneous
Motukoreaite (TL)17.1.7.1Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Basalt'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
'Limonite'-(Fe,O,OH,H2O)
'Tuff'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
H MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O Limonite(Fe,O,OH,H2O)
O MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
O QuartzSiO2
NaSodium
Na MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
MgMagnesium
Mg MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
AlAluminium
Al MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
SiSilicon
Si QuartzSiO2
SSulfur
S MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
CaCalcium
Ca CalciteCaCO3
FeIron
Fe Limonite(Fe,O,OH,H2O)

References

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Year (asc) Year (desc) Author (A-Z) 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, Vol 41: 319, 389-390.


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