Gawler Downs, Ashburton District, Canterbury Region, New Zealandi
| Regional Level Types | |
|---|---|
| Gawler Downs | Highlands |
| Ashburton District | District |
| Canterbury Region | Region |
| New Zealand | Country |
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Latitude & Longitude (WGS84):
43° 45' 0'' South , 171° 21' 56'' East
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
417828
Long-form identifier:
mindat:1:2:417828:9
GUID (UUID V4):
e38f90b1-fc0f-42db-8c61-30bd68ce7053
Other/historical names associated with this locality:
Surrey Hills
"Palla is a minor component of the Surrey Hills Tuff, which represents the basal formation of the Mt Somers Volcanics, of mid Cretaceous age (Oliver and Keene 1989). This formation is up to 50 metres thick in places but typically less than 10 metres, and consists of welded ignimbrite, tuff and tuffaceous sediments of variable induration. It is preserved only in isolated pockets. The most extensive outcrops are at Mt Alford, and other occurrences have been recorded in the Mt Somers area, the Peter Range and along the north branch of the Hinds River (Oliver 1977; Oliver and Keene 1989). At Surrey Hills the formation rests on Mesozoic greywacke and is overlain by Hinds River Dacite. The palla is probably a water-laid tuff, deposited in a shallow lake environment, and subsequently silicified as a result of later volcanism." (Moore and Trotter, 2017)
Known mainly for agates, this area also has minor zeolites.
NOTE: This is private land and access is not only restricted but some sections are also covered by protection covenants.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
5 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 DiagramDetailed Mineral List:
| β Celadonite Formula: K(MgFe3+◻)(Si4O10)(OH)2 References: |
| β 'Chabazite' References: |
| β Erionite-K Formula: (K2,Ca,Na2)2[Al4Si14O36] · 15H2O References: Rod Martin CollectionIdentification: XRD, SEM-EDS, TEM |
| β 'Erionite Subgroup' Formula: M2[Al4Si14O36] · 15H2O |
| β Hematite Formula: Fe2O3 References: |
| β 'Heulandite Subgroup' Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| β Opal Formula: SiO2 · nH2O References: |
| β Opal var. Opal-AN Formula: SiO2 · nH2O References: |
| β Quartz Formula: SiO2 |
| β Quartz var. Agate |
| β 'Thomsonite Subgroup' References: |
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| β | Hematite | 4.CB.05 | Fe2O3 |
| β | Quartz var. Agate | 4.DA.05 | SiO2 |
| β | 4.DA.05 | SiO2 | |
| β | Opal var. Opal-AN | 4.DA.10 | SiO2 Β· nH2O |
| β | 4.DA.10 | SiO2 Β· nH2O | |
| Group 9 - Silicates | |||
| β | Celadonite | 9.EC.15 | K(MgFe3+β»)(Si4O10)(OH)2 |
| β | Erionite-K | 9.GD.20 | (K2,Ca,Na2)2[Al4Si14O36] Β· 15H2O |
| Unclassified | |||
| β | 'Chabazite' | - | |
| β | 'Erionite Subgroup' | - | M2[Al4Si14O36] Β· 15H2O |
| β | 'Heulandite Subgroup' | - | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] Β· nH2O |
| β | 'Thomsonite Subgroup' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| H | β Erionite Subgroup | M2[Al4Si14O36] · 15H2O |
| H | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| H | β Opal var. Opal-AN | SiO2 · nH2O |
| H | β Opal | SiO2 · nH2O |
| H | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| O | Oxygen | |
| O | β Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| O | β Erionite Subgroup | M2[Al4Si14O36] · 15H2O |
| O | β Hematite | Fe2O3 |
| O | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| O | β Opal var. Opal-AN | SiO2 · nH2O |
| O | β Opal | SiO2 · nH2O |
| O | β Quartz | SiO2 |
| O | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| Na | Sodium | |
| Na | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Na | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| Mg | Magnesium | |
| Mg | β Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| Al | Aluminium | |
| Al | β Erionite Subgroup | M2[Al4Si14O36] · 15H2O |
| Al | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Al | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| Si | Silicon | |
| Si | β Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| Si | β Erionite Subgroup | M2[Al4Si14O36] · 15H2O |
| Si | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Si | β Opal var. Opal-AN | SiO2 · nH2O |
| Si | β Opal | SiO2 · nH2O |
| Si | β Quartz | SiO2 |
| Si | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| K | Potassium | |
| K | β Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| K | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| K | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| Ca | Calcium | |
| Ca | β Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| Ca | β Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| Fe | Iron | |
| Fe | β Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| Fe | β Hematite | Fe2O3 |
Other Regions, Features and Areas containing this locality
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References
Gawler Downs, Ashburton District, Canterbury Region, New Zealand