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Hendersons Quarry, Mount Ngongotaha, Rotorua District, Bay of Plenty Region, New Zealandi
Regional Level Types
Hendersons QuarryQuarry
Mount NgongotahaMountain
Rotorua DistrictDistrict
Bay of Plenty RegionRegion
New ZealandCountry

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Key
Latitude & Longitude (WGS84):
38° 5' 47'' South , 176° 12' 33'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Rotorua65,901 (2017)5.6km
Mamaku751 (2017)11.0km
Tokoroa14,277 (2014)33.6km
Paengaroa901 (2011)36.0km
Reporoa595 (2017)39.4km


Mt. Ngongotaha is a rhyolite dome with high-temperature gas phase-deposited silicate and oxide minerals present in vesicules.

This is an operating quarry, for aggregate, about 5km north of Rotorua, and access to collectors is very restricted. Matt Henderson has allowed local rock clubs, mineral symposium field trips, and geologists entry (but not individual collectors just wanting to have a look). The location is one of the most represented in local collections for New Zealand. A 2007 visit stated material was found in boulders along the edges of the upper benches. It appears collectors became aware of specimens at the location around 1990, as Hosking (1990) below shows a process of local collectors trying to work out the species. Initially several were mis-identified (elbaite etc) as they struggled with the tiny crystals, and lack of professional equipment.

Mt Ngongataha is a collection of nine rhyolite domes, the quarry situated in the oldest. The quarry shows an upper finely vesicular pale pumice, commonly brecciated. Below this is fractured brecciated banded obsidian. Next down is grey rhyolite, where most of the specimens are found, and mined for aggregate. It contains many cavities from a few mms to several cms across, often complexly interconnected, showing contortion structures along the walls, and lined with tridymite. The overall appearance is pale grey rock, with many snowy white patches of small bladed tridymite crystal lined cavities.

Most specimens are micro to thumbnail. Tridymite is the most common species, and subsequent species should be considered as part of tridymite lined cavities, unless other wise stated. Tridymite is found as tiny clear, hexagonal crystals and plates, often so thin they are shattered. May also be seen as pale-yellow. Some quartz is found on top of the tridymite as clear crystals.

Fayalite is said to be the next most common mineral, orthorhombic, equant crystals to several mms, scattered singularly, with some multiples, opaque brown, possibly showing iridescence. Sometimes blocky amphibole needles are associated but few other species. It may also be found as short stubby crystals, black coloured, but thin crystals show as greenish, or beer bottle brown.

Iron rich edenite as slender needles or hairs, one cm or more long, as sprays (but not matted), monoclinic prisms, diamond shape in cross section, or hexagonal in thicker crystals. White or brown depending on Fe content.

Hematite as lustrous black hexagonal plates as possibly the most common, but seen in various other forms including barrel shaped crystals, rosettes of thin blades, minute balls speared by edenite needles, specularite, or botryoidal. The hematite contains 10% titanium oxide. An unusual growth habit, is hematite next to titanite crystals, will grow around the titanite without touching it, leaving the hematite arching over the titanite crystal.

Titanite as tiny yellow-orange scattered simple prismatic crystals, sometimes impaled on augite and edenite needles.

Phlogopite as thin hexagonal plates, standing on edge, as single long crystals, and rarely in groups. They are colourless, but the Fe content means they often have an orange tint.

Augite as tiny golden yellow scattered eight sided needles or crystals. Sometimes titanite crystals are found attached on the augite crystals.

Pseudobrookite as small spray groups, or singular thin black shiny bladed crystals. The thinnest crystals show as brownish or reddish tints. The crystals terminate as a flat wedge. The crystals are often less than one mm wide, and only a few mms long. Have been observed growing out of hematite crystals.

Mullite or porcelainite forms tiny sprays of acicular needles, 0.01 mms across, several mms long, square in cross section, with flat terminations. The material is rare, a faint lavender colour, associated with hematite, phlogopite, and osumilite.

Osumilite is a rare silicate, usually a lustrous black, but at Hendersons Quarry can be found as blue-green, and rarely pale yellowish, due to its low iron, and high silica content at the quarry. Hexagonal crystals to 3 mms long, nearly equant, simple prisms, translucent, rough surfaces, and flat terminations. The species is found in a narrow central zone in the quarry, rare, as single crystals or sometimes groups. Associated with hematite, mullite, and phlogopite.

Magnetite as small octahedral crystals with titanite, and quartz on thicker tridymite lined cavities. Goethite as glassy black single blocky crystals, dog tooth like crystals, radiating clusters, or iridescent mammillary. Photographs on Mindat indicate rare pyrite and marcasite is found in the quarry.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


21 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Jens Richnow(1999): Eruptional and post-eruptional processes in rhyolite domes. PhD thesis, University of Canterbury.
'Andradite-Grossular Series'
Reference: Rod Martin personal collection
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Martin Stolworthy Collection
Cristobalite
Formula: SiO2
Reference: Collection of RJ Martin
Edenite
Formula: {Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Reference: Martin Stolworthy Collection
Fayalite
Formula: Fe2+2SiO4
Reference: Martin Stolworthy Collection
Ferro-edenite
Formula: {Na}{Ca2}{Fe2+5}(AlSi7O22)(OH)2
Reference: Martin Stolworthy Collection
Fluoro-edenite
Formula: {Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
Reference: "Ian Graham" Collection
Hematite
Formula: Fe2O3
Reference: Martin Stolworthy Collection
Hematite var: Specularite
Formula: Fe2O3
Reference: Collection of RJ Martin
'Hornblende'
Reference: Martin Stolworthy Collection
'Hypersthene'
Formula: (Mg,Fe)SiO3
Reference: Collection of RJ Martin correlated to examples in related Rotorua rhyolites
Ilmenite
Formula: Fe2+TiO3
Reference: Martin Stolworthy Collection
Magnetite
Formula: Fe2+Fe3+2O4
Reference: J. Thornton, ed., Micro-Scope, February 1994
Marcasite
Formula: FeS2
Reference: Collection of RJ Martin
Mullite
Formula: Al4+2xSi2-2xO10-x
Reference: Martin Stolworthy Collection
Osumilite-(Mg)
Formula: KMg2Al3(Al2Si10)O30
Reference: Grapes, R., Thornton, J., and Howard, D. (1993. Vug minerals in rhyolite, Hendersons Quarry, Mount Ngongotaha, Geological Society of New Zealand, Miscellaneous Publication 79A: 76.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Martin Stolworthy Collection
Pseudobrookite
Formula: Fe2TiO5
Reference: Martin Stolworthy Collection
Pyrite
Formula: FeS2
Reference: Collection of RJ Martin
'Pyroxene Group'
Reference: Collection of RJ Martin
Quartz
Formula: SiO2
Reference: Martin Stolworthy Collection
Richterite
Formula: {Na}{NaCa}{Mg5}(Si8O22)(OH)2
Reference: http://www.abdn.ac.uk/geology/profiles/analysis/software.htm recalc of http://www.abdn.ac.uk/geology/profiles/analysis/software.htm recalc of ferrikatophorite data
Titanite
Formula: CaTi(SiO4)O
Reference: Martin Stolworthy Collection
Tridymite
Formula: SiO2
Reference: Martin Stolworthy Collection
Zircon
Formula: Zr(SiO4)
Reference: Collection of RJ Martin correlated to similar rhyolites

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Marcasite2.EB.10aFeS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Cristobalite4.DA.15SiO2
Hematite4.CB.05Fe2O3
var: Specularite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Pseudobrookite4.CB.15Fe2TiO5
Quartz4.DA.05SiO2
Tridymite4.DA.10SiO2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Edenite9.DE.15{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Fayalite9.AC.05Fe2+2SiO4
Ferro-edenite9.DE.15{Na}{Ca2}{Fe2+5}(AlSi7O22)(OH)2
Fluoro-edenite9.DE.15{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
Mullite9.AF.20Al4+2xSi2-2xO10-x
Osumilite-(Mg)9.CM.05KMg2Al3(Al2Si10)O30
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Richterite9.DE.20{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Titanite9.AG.15CaTi(SiO4)O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Andradite-Grossular Series'-
'Hornblende'-
'Hypersthene'-(Mg,Fe)SiO3
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
AB2X5
Pseudobrookite7.7.1.1Fe2TiO5
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Fayalite51.3.1.1Fe2+2SiO4
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Mullite52.2.3.1Al4+2xSi2-2xO10-x
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Edenite66.1.3a.10{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Richterite66.1.3b.9{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Cristobalite75.1.1.1SiO2
Quartz75.1.3.1SiO2
Tridymite75.1.2.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Andradite-Grossular Series'-
Ferro-edenite-{Na}{Ca2}{Fe2+5}(AlSi7O22)(OH)2
Fluoro-edenite-{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
Hematite
var: Specularite
-Fe2O3
'Hornblende'-
'Hypersthene'-(Mg,Fe)SiO3
Osumilite-(Mg)-KMg2Al3(Al2Si10)O30
'Pyroxene Group'-

List of minerals for each chemical element

HHydrogen
H Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
H Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2
H Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
OOxygen
O Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
O Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
O FayaliteFe22+SiO4
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O TitaniteCaTi(SiO4)O
O TridymiteSiO2
O PhlogopiteKMg3(AlSi3O10)(OH)2
O PseudobrookiteFe2TiO5
O Osumilite-(Mg)KMg2Al3(Al2Si10)O30
O QuartzSiO2
O IlmeniteFe2+TiO3
O HematiteFe2O3
O MulliteAl4+2xSi2-2xO10-x
O Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2
O MagnetiteFe2+Fe23+O4
O AlbiteNa(AlSi3O8)
O Hypersthene(Mg,Fe)SiO3
O Hematite (var: Specularite)Fe2O3
O CristobaliteSiO2
O ZirconZr(SiO4)
O Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
FFluorine
F Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
NaSodium
Na Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
Na Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Na Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Na AlbiteNa(AlSi3O8)
Na Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
MgMagnesium
Mg Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Osumilite-(Mg)KMg2Al3(Al2Si10)O30
Mg Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Mg Hypersthene(Mg,Fe)SiO3
Mg Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
AlAluminium
Al Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
Al Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Osumilite-(Mg)KMg2Al3(Al2Si10)O30
Al MulliteAl4+2xSi2-2xO10-x
Al AlbiteNa(AlSi3O8)
Al Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
SiSilicon
Si Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
Si Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Si FayaliteFe22+SiO4
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si TitaniteCaTi(SiO4)O
Si TridymiteSiO2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si Osumilite-(Mg)KMg2Al3(Al2Si10)O30
Si QuartzSiO2
Si MulliteAl4+2xSi2-2xO10-x
Si Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Si AlbiteNa(AlSi3O8)
Si Hypersthene(Mg,Fe)SiO3
Si CristobaliteSiO2
Si ZirconZr(SiO4)
Si Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
SSulfur
S MarcasiteFeS2
S PyriteFeS2
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
K Osumilite-(Mg)KMg2Al3(Al2Si10)O30
CaCalcium
Ca Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
Ca Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca TitaniteCaTi(SiO4)O
Ca Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Ca Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
TiTitanium
Ti TitaniteCaTi(SiO4)O
Ti PseudobrookiteFe2TiO5
Ti IlmeniteFe2+TiO3
FeIron
Fe Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
Fe FayaliteFe22+SiO4
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe PseudobrookiteFe2TiO5
Fe IlmeniteFe2+TiO3
Fe HematiteFe2O3
Fe MagnetiteFe2+Fe23+O4
Fe Hypersthene(Mg,Fe)SiO3
Fe Hematite (var: Specularite)Fe2O3
Fe MarcasiteFeS2
Fe PyriteFeS2
ZrZirconium
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Hosking, T. (1990) Hendersons Quarry Ngongotaha Haparangi Rhyolite 2. PDF (Otago Rock and Mineral Club website).
Grapes, R., Thornton, J., Howard, D. (1993) Vug minerals in rhyolite, Hendersons Quarry, Mount Ngongotaha. Geological Society of New Zealand, Miscellaneous Publication 79A: 76.
Richnow, J. (1999) Eruptional and post-eruptional processes in rhyolite domes. PhD thesis, (vol 1 & 2) University of Canterbury.

External Links


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