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Hokonui Hills, Southland District, Southland Region, South Island, New Zealand

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Latitude & Longitude (WGS84): 46° 1' 38'' South , 168° 40' 26'' East
Latitude & Longitude (decimal): -46.02728,168.67396
Köppen climate type:Cfb : Temperate oceanic climate


In marine Lower Triassic Gavenwood Tuffs, Murihiku Supergroup.

The two minerals were discovered from an examination of rocks containing celadonite. The material was so small even electron microprobes battled to identify the material properly, and it needed to be sent to the University of Michigan, for specialist study.

Celadonite is partly responsible for the dark green colour of the sedimentary rocks and volcanic ash beds that show in the hills. The new species occur as sub-micrometre grains in vesicle interiors, both are blue-green in colour, and replace glass shards. It is intimately associated with heulandite, and intergrown with chlorite, bethierine, and corrensite.

In hand specimens the host rock is dark greyish-green with reddish flecks, showing feldspar clasts 1-3 mms in diameter, with darker patches of micropumice and lapilli. Other species found in the hand specimens, but not associated with the new species were plagioclase, titanite, pyrite, quartz, albite, siderite, labradorite, augite, oligoclase, magnetite, hornblende, biotite, and rare prehnite.

The study site was near Pukerau, just east of Gore, however the material is likely widespread, the hills covering some 60 kilometres, trending east-west.


Mineral List


5 valid minerals. 2 (TL) - type locality of valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Jurassic
145 - 201.3 Ma



ID: 3189617
Mesozoic sedimentary rocks

Age: Jurassic (145 - 201.3 Ma)

Stratigraphic Name: Murihiki Supergroup

Comments: Hokonui Terrane

Lithology: Sandstone,siltstone; body fossils,turbidite

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Toarcian - Rhaetian
174.1 - 208.5 Ma



ID: 1369479
Diamond Peak Group sandstone

Age: Mesozoic (174.1 - 208.5 Ma)

Stratigraphic Name: Diamond Peak Group

Description: Fine sandstone and siltstone with rare conglomerate tuff and grit beds.

Comments: Basement (Eastern Province) sedimentary rocks. Age based on macropaleontology

Lithology: Major:: {sandstone},Minor:: {conglomerate, siltstone, tuff}

Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1. [13]

Early Jurassic
174.1 - 201.3 Ma



ID: 1310801
Diamond Peak Group

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Diamond Peak Group

Description: Sandstone, siltstone and mudstone with minor tuff and conglomerate.

Comments: Eastern Province (Murihiku Terrane) Rocks

Lithology: Sandstone, siltstone, mudstone, tuffite, conglomerate

Reference: Edbrooke, S.W., Heron, D.W., Forsyth, P.J., Jongens, R. (compilers). Geology Map of New Zealand 1:1 000 000. GNS Science Geological Map 2. [12]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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)
Railton, G.T., Watters, W.A. (1990) Minerals of New Zealand. New Zealand Geological Survey Bulletin 104, 89 pages.
Li, G., Peacor, D.R., Coombs, D.S., Kawachi, Y. (1997) Solid solution in the celadonite family: The new minerals ferroceladonite, K2Fe2/2+Fe3/2+Si8O20(OH)4 and ferroaluminoceladonite, K2Fe2/2+Al2Si8O20(OH)4. American Mineralogist, 82(5-6), 503-511.

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