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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.


Mineral List


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

Rock Types Recorded

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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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.

Mineral and/or Locality  
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