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Parapara River (Richmond Hill Porphyry), Richmond Hill, Aorere Goldfield, Tasman Region, South Island, New Zealand

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Latitude & Longitude (WGS84): 40° 46' 16'' South , 172° 39' 20'' East
Latitude & Longitude (decimal): -40.77113,172.65569
GeoHash:G#: rbfb0cu4c
Locality type:River
Köppen climate type:Cfb : Temperate oceanic climate


Quartz-veined ophicarbonate, consisting of ferroan dolomite-ankerite-calcite-talc, and rare goethite.

(Grapes et al, 1999) describes some mineralised lodes on and near the Richmond Hill Mine, which is listed as a separate entry, and then mineralisation for the surrounding Parapara River/Richmond Hill Porphyry. This is a small gneissic granodiorite pluton. The mineralisation between the mine and porphyry are quite different.

The gersdorffite occurrence is north of the mine, as a 21 metre wide, iron stained talc carbonate with quartz veins. The contact between the porphyry, and Waingaro Schist is marked with 50-100 mm band of magnesite-quartz, while the main part of the body contains antigorite-talc-magnesite, with rare peridotite, amphibolite, and chlorite schist.

The gersdorffite occurs as tiny homogeneous euhedral microscopic crystals, of a pyritohedral habit. It is found with pyrrhotite, chromite, tremolite, and calcite. Chromite has been partly replaced with chromian magnetite and magnetite. Chromite occurs as clusters of angular grains. Calcite as boundaries to quartz, and larger areas enclosing quartz grains.

The pyrrhotite is partly replaced by pyrite, in turn replaced by violarite. The pyrite and violarite, and more rarely pyrrhotite-pyrite occurs as intergrowths in veins, along cleavage planes in tremolite, talc, and carbonates, and within interstitial areas.

Mindat map approximate, as the source merely shows a map of the porphyry in relation to the Richmond Hill Mine.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


18 valid minerals.

Detailed Mineral List:

Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Antigorite
Formula: Mg3(Si2O5)(OH)4
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Baryte
Formula: BaSO4
Reference: PMB collection
Brucite
Formula: Mg(OH)2
Reference: Railton, G.L., Watters, W.A. (1990) Minerals of New Zealand, New Zealand Geological Survey Bulletin No. 104.
Calcite
Formula: CaCO3
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
'Chlorite Group'
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Chromite
Formula: Fe2+Cr3+2O4
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Dolomite
Formula: CaMg(CO3)2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Dolomite var: Ferroan Dolomite
Formula: Ca(Mg,Fe)(CO3)2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Fluorite
Formula: CaF2
Reference: PMB collection
Gersdorffite
Formula: NiAsS
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Goethite
Formula: α-Fe3+O(OH)
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Magnesite
Formula: MgCO3
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Pyrite
Formula: FeS2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Pyrrhotite
Formula: Fe7S8
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Pyrrhotite var: Nickeloan Pyrrhotite
Formula: (Fe,Ni)7S8
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Quartz
Formula: SiO2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Talc
Formula: Mg3Si4O10(OH)2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.
Violarite
Formula: Fe2+Ni3+2S4
Reference: New Zealand Journal of Geology and Geophysics, 1999, Vol. 42: 189-204; Grapes, R. H., and G. A. Challis. "Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand." New Zealand journal of geology and geophysics 42, no. 2 (1999): 189-204.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Gersdorffite2.EB.25NiAsS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
var: Nickeloan Pyrrhotite2.CC.10(Fe,Ni)7S8
Violarite2.DA.05Fe2+Ni3+2S4
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Brucite'4.FE.05Mg(OH)2
'Chromite'4.BB.05Fe2+Cr3+2O4
Goethite4.00.α-Fe3+O(OH)
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Ankerite'5.AB.10Ca(Fe2+,Mg)(CO3)2
'Calcite'5.AB.05CaCO3
'Dolomite'5.AB.10CaMg(CO3)2
var: Ferroan Dolomite5.AB.10Ca(Mg,Fe)(CO3)2
Magnesite5.AB.05MgCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Baryte'7.AD.35BaSO4
Group 9 - Silicates
'Antigorite'9.ED.15Mg3(Si2O5)(OH)4
Talc9.EC.05Mg3Si4O10(OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 3:4
Violarite2.10.1.8Fe2+Ni3+2S4
AmBnXp, with (m+n):p = 1:2
Gersdorffite2.12.3.2NiAsS
Pyrite2.12.1.1FeS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
X(OH)2
Brucite6.2.1.1Mg(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Magnesite14.1.1.2MgCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Antigorite71.1.2a.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Talc71.2.1.3Mg3Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
Dolomite
var: Ferroan Dolomite
-Ca(Mg,Fe)(CO3)2
Pyrrhotite
var: Nickeloan Pyrrhotite
-(Fe,Ni)7S8

List of minerals for each chemical element

HHydrogen
H AntigoriteMg3(Si2O5)(OH)4
H BruciteMg(OH)2
H Goethiteα-Fe3+O(OH)
H TalcMg3Si4O10(OH)2
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
C MagnesiteMgCO3
OOxygen
O AnkeriteCa(Fe2+,Mg)(CO3)2
O AntigoriteMg3(Si2O5)(OH)4
O BaryteBaSO4
O BruciteMg(OH)2
O CalciteCaCO3
O ChromiteFe2+Cr23+O4
O DolomiteCaMg(CO3)2
O Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
O Goethiteα-Fe3+O(OH)
O MagnesiteMgCO3
O MagnetiteFe2+Fe23+O4
O QuartzSiO2
O TalcMg3Si4O10(OH)2
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
FFluorine
F FluoriteCaF2
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg AntigoriteMg3(Si2O5)(OH)4
Mg BruciteMg(OH)2
Mg DolomiteCaMg(CO3)2
Mg Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Mg MagnesiteMgCO3
Mg TalcMg3Si4O10(OH)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SiSilicon
Si AntigoriteMg3(Si2O5)(OH)4
Si QuartzSiO2
Si TalcMg3Si4O10(OH)2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SSulfur
S BaryteBaSO4
S GersdorffiteNiAsS
S Pyrrhotite (var: Nickeloan Pyrrhotite)(Fe,Ni)7S8
S PyriteFeS2
S PyrrhotiteFe7S8
S ViolariteFe2+Ni23+S4
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Ca FluoriteCaF2
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe ChromiteFe2+Cr23+O4
Fe Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Fe Goethiteα-Fe3+O(OH)
Fe MagnetiteFe2+Fe23+O4
Fe Pyrrhotite (var: Nickeloan Pyrrhotite)(Fe,Ni)7S8
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe ViolariteFe2+Ni23+S4
NiNickel
Ni GersdorffiteNiAsS
Ni Pyrrhotite (var: Nickeloan Pyrrhotite)(Fe,Ni)7S8
Ni ViolariteFe2+Ni23+S4
AsArsenic
As GersdorffiteNiAsS
BaBarium
Ba BaryteBaSO4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Railton, G.L., Watters, W.A. (1990) Minerals of New Zealand, New Zealand Geological Survey Bulletin No. 104.
Grapes, R.H., Challis, G.A. (1999) Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 42:2, 189-204.


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