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Repanga Island (Cuvier Island), Thames-Coromandel District, Waikato Region, North Island, New Zealand

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Latitude & Longitude (WGS84): 36° 25' 59'' South , 175° 46' 0'' East
Latitude & Longitude (decimal): -36.43333,175.76667
GeoHash:G#: rcsbxxt2k
Locality type:Island


Feruvite was formed by hydrothermal replacement of silicates in a pegmatitic rock.

The island is a wildlife sanctuary.

Interest in the geology of the island is centred on two rare species found here. Neither appears to be specimen grade material, at least described in the sources, and being a conservation area is off limits anyway.

Grandidierite was described by (Black, 1970), at the time only found on Madagascar and Cuvier Island. It is a magnesium aluminium borosilicate. It was found at two locations, both is an aureole surrounding small diorite stocks. At Blanket Bay it was found associated with hypersthene-cordierite-biotite-spessartine-andesine-pyrrhotite, and at Landing Bay with hypersthene-biotite-andesine-orthoclase-quartz-rutile-magnetite.

The island is the type locality of feruvite, and at the time of writing (2018) is found at fourteen locations worldwide on Mindat. It is named after its crystal and chemical similarity to uvite. It is found as a light grey core surrounded by dravite, and overprinted by schorl/dravite, all black-brown members of the tourmaline group. There is no indication of crystal specimens with the material found as grains, aggregating into dark patches at 30% volume of a tourmalised rock. It is associated with quartz, microcline, chlorapatite, and pyrite. It is the iron analog of uvite, and the calcium analog of schorl.


Mineral List


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

Rock Types Recorded

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Alphabetical List Tree Diagram


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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Reed, J.J. (1963) Tourmalised rocks on Cuvier Island. New Zealand Journal of Geology and Geophysics, 6:5, 714-715.
Black, P.M. (1967) Petrology of the Cuvier and Paritu plutons and their metamorphic aureoles. Unpublished Ph.D. thesis, University of Auckland, 354 pages.
Black, P.M. (1970) Grandidierite from Cuvier Island, New Zealand. Mineralogical Magazine, Vol. 37, No. 289, 615-617.
Grice, J.D., Robinson, G.W. (1989) Feruvite, a new member of the tourmaline group, and its crystal structure. Canadian Mineralogist, Vol. 27, 199-203.

Mineral and/or Locality  
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