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Alma Mineral Breccia, Oamaru, Otago Region, New Zealandi
Regional Level Types
Alma Mineral BrecciaOutcrop
OamaruCity
Otago RegionRegion
New ZealandCountry

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PhotosMapsSearch
07587910017272322742065.jpg
Roadside outcrop

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
02689710017272322758685.jpg
Outcrop detail.

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
01383670017272322767452.jpg
Augite, etc.

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
07587910017272322742065.jpg
Roadside outcrop

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
02689710017272322758685.jpg
Outcrop detail.

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
01383670017272322767452.jpg
Augite, etc.

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
07587910017272322742065.jpg
Roadside outcrop

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
05438540017272322763103.jpg
Outcrop detail.

Alma Mineral Breccia, Oamaru, Otago Region, New Zealand
Latitude & Longitude (WGS84):
45° 6' 30'' South , 170° 55' 5'' East
Latitude & Longitude (decimal):
-45.10844,170.91818
GRN:
S31E87
Type:
Outcrop
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Oamaru13,000 (2017)4.3km
Kakanui443 (2013)8.4km
Kurow422 (2015)54.6km
Mindat Locality ID:
248284
Long-form identifier:
mindat:1:2:248284:5
GUID (UUID V4):
0
Other/historical names associated with this locality:
Alma Road cutting


Road works (1999) exposed a new outcrop of garnet-bearing breccia at Alma, North Otago. The rocks and minerals within the breccia are similar to those present in the classic mineral breccia at Kakanui.

Road works at the junction of State Highway 1 and Whiterocks Road, comprised a cutting 2.5 metres high, and around 40 metres long. When investigated by Reay et.al. in 2002, weathering had already effected the integrity of the site.

'A mantle sourced diatreme with associated reworked marine volcaniclastic mantle xenoliths, including Iherzolite and garnet pyroxenites, occurring with megacrysts of garnet, clinopyroxene, kaersutite, and feldspar.'

The horizon is underlain with a partly pillowed lava flow, and overlain by bioclastic limestone. The megacryst horizon is dominated by rounded glassy clinopyroxene, then garnet (pyrope-almandine).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


7 valid minerals.

Rock Types Recorded

Note: 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)
ⓘ Albite var. Anorthoclase
Formula: (Na,K)AlSi3O8
ⓘ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Calcite
Formula: CaCO3
ⓘ Calcite var. Iron-bearing Calcite
Formula: (Ca,Fe)CO3
ⓘ 'Clinopyroxene Subgroup'
ⓘ Diopside
Formula: CaMgSi2O6
ⓘ Diopside var. Chromium-bearing Diopside
Formula: Ca(Mg,Cr)Si2O6
ⓘ 'Fayalite-Forsterite Series'
ⓘ 'Feldspar Group'
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ 'Glass'
ⓘ Kaersutite
Formula: NaCa2(Mg3AlTi4+)(Si6Al2)O22O2
ⓘ Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
ⓘ 'Palagonite'
ⓘ Spinel
Formula: MgAl2O4

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘSpinel4.BB.05MgAl2O4
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘvar. Iron-bearing Calcite5.AB.05(Ca,Fe)CO3
Group 9 - Silicates
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘDiopside
var. Chromium-bearing Diopside		9.DA.15Ca(Mg,Cr)Si2O6
ⓘ9.DA.15CaMgSi2O6
ⓘKaersutite9.DE.15NaCa2(Mg3AlTi4+)(Si6Al2)O22O2
ⓘMontmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘvar. Anorthoclase9.FA.35(Na,K)AlSi3O8
Unclassified
ⓘ'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ'Feldspar Group'-
ⓘ'Clinopyroxene Subgroup'-
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Glass'-
ⓘ'Palagonite'-

List of minerals for each chemical element

HHydrogen
Hⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
CCarbon
Cⓘ CalciteCaCO3
Cⓘ Calcite var. Iron-bearing Calcite(Ca,Fe)CO3
OOxygen
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ CalciteCaCO3
Oⓘ Diopside var. Chromium-bearing DiopsideCa(Mg,Cr)Si2O6
Oⓘ DiopsideCaMgSi2O6
Oⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Oⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Oⓘ SpinelMgAl2O4
Oⓘ Fayalite-Forsterite Series
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ Calcite var. Iron-bearing Calcite(Ca,Fe)CO3
FFluorine
Fⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Naⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Naⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ Diopside var. Chromium-bearing DiopsideCa(Mg,Cr)Si2O6
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Mgⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Mgⓘ SpinelMgAl2O4
Mgⓘ Fayalite-Forsterite Series
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Alⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Alⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Alⓘ SpinelMgAl2O4
SiSilicon
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ Diopside var. Chromium-bearing DiopsideCa(Mg,Cr)Si2O6
Siⓘ DiopsideCaMgSi2O6
Siⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Siⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Siⓘ Fayalite-Forsterite Series
Siⓘ Garnet GroupX3Z2(SiO4)3
ClChlorine
Clⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
CaCalcium
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ CalciteCaCO3
Caⓘ Diopside var. Chromium-bearing DiopsideCa(Mg,Cr)Si2O6
Caⓘ DiopsideCaMgSi2O6
Caⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Caⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Caⓘ Calcite var. Iron-bearing Calcite(Ca,Fe)CO3
TiTitanium
Tiⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiⓘ KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
CrChromium
Crⓘ Diopside var. Chromium-bearing DiopsideCa(Mg,Cr)Si2O6
FeIron
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ Fayalite-Forsterite Series
Feⓘ Calcite var. Iron-bearing Calcite(Ca,Fe)CO3

Other Regions, Features and Areas containing this locality

Australian Plate
New Zealand
Pacific PlateTectonic Plate

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

Reay, A., Chappell, D., Garden, B. (2002) A new garnet‐bearing mineral breccia from North Otago, New Zealand. New Zealand Journal of Geology and Geophysics, 45:4, 461-466.
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