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Hokonui Hills, Southland District, Southland Region, South Island, New Zealandi
Regional Level Types
Hokonui HillsGroup of Hills
Southland DistrictDistrict
Southland RegionRegion
South IslandIsland
New ZealandCountry

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Latitude & Longitude (WGS84): 46° 1' 38'' South , 168° 40' 26'' East
Latitude & Longitude (decimal): -46.02728,168.67396
GeoHash:G#: pxzfnkbxs
Locality type:Group of Hills
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Riversdale371 (2011)15.3km
Gore12,108 (2011)22.4km
Winton2,193 (2011)29.6km
Edendale583 (2011)33.2km
Wyndham586 (2011)36.6km


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.

Regions containing this locality

Pacific PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


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

Detailed Mineral List:

Berthierine
Formula: (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Reference: Gejing Li et al. : "Solid solution in the celadonite family: The new minerals ferroceladonite and and ferroaluminoceladonite", American Mineralogist, Volume 82, pages 503–511, 1997
Celadonite
Formula: K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Reference: Railton, G.T., Watters, W.A. (1990) Minerals of New Zealand. New Zealand Geological Survey Bulletin 104, 89 pages.
'Chlorite Group'
Reference: Gejing Li et al. : "Solid solution in the celadonite family: The new minerals ferroceladonite and and ferroaluminoceladonite", American Mineralogist, Volume 82, pages 503–511, 1997
Corrensite
Formula: (Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
Reference: Gejing Li et al. : "Solid solution in the celadonite family: The new minerals ferroceladonite and and ferroaluminoceladonite", American Mineralogist, Volume 82, pages 503–511, 1997
Ferroaluminoceladonite (TL)
Formula: K(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Type Locality:
Reference: Gejing Li et al. : "Solid solution in the celadonite family: The new minerals ferroceladonite and and ferroaluminoceladonite", American Mineralogist, Volume 82, pages 503–511, 1997
Ferroceladonite (TL)
Formula: K(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Type Locality:
Reference: AM 82 (1997)
'Heulandite subgroup'
Reference: Gejing Li et al. : "Solid solution in the celadonite family: The new minerals ferroceladonite and and ferroaluminoceladonite", American Mineralogist, Volume 82, pages 503–511, 1997

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
Berthierine9.ED.15(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Celadonite9.EC.15K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Corrensite9.EC.60(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
Ferroaluminoceladonite (TL)9.EC.15K(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Ferroceladonite (TL)9.EC.15K(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Heulandite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Berthierine71.1.2c.2(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Sheets of 6-membered rings with 2:1 layers
Celadonite71.2.2a.6K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Corrensite71.4.2.5(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
Ferroaluminoceladonite (TL)-K(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Ferroceladonite (TL)-K(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
'Heulandite subgroup'-

List of minerals for each chemical element

HHydrogen
H FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
H FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
H CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
H Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
H Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
OOxygen
O FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
O FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
O CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
O Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
O Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
NaSodium
Na Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
MgMagnesium
Mg CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Mg Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
AlAluminium
Al FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Al Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Al Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
SiSilicon
Si FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Si FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Si CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Si Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Si Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
KPotassium
K FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
K FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
K CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
K Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
CaCalcium
Ca Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
FeIron
Fe FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Fe FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Fe CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Fe Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Fe Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) 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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