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Tresayes Quarry (Polpuff Quarry), Trezaise (Tresayes), Roche, Cornwall, England, UKi
| Regional Level Types | |
|---|---|
| Tresayes Quarry (Polpuff Quarry) | Quarry |
| Trezaise (Tresayes) | Hamlet |
| Roche | Civil Parish |
| Cornwall | County |
| England | Constituent Country |
| UK | Country |
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Latitude & Longitude (WGS84):
50° 23' 34'' North , 4° 49' 15'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW993590
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Roche | 2,517 (2017) | 1.9km |
| Bugle | 2,873 (2017) | 2.0km |
| Nanpean | 2,563 (2017) | 4.3km |
| Saint Dennis | 2,206 (2016) | 4.5km |
| Luxulian | 388 (2017) | 5.5km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| British Micromount Society, Devon and Cornwall Branch Meetings | Liskeard, Cornwall | 26km |
Other/historical names associated with this locality:
Roche Felspar Works / Glass Mine
A disused quarry in a pegmatite known for its large feldspar crystals. First opened in the late 1870s, the Mining Journal records that production was hampered by severe winters on this exposed common. Early production was for pure feldspar which was used for making glass and the quarry was known locally as the glass mine. Although worked mainly as a quarry there are reputed to be underground workings.
The quarry was re-opened in 1917, during the First World War, to provide feldspar for electrical porcelain. It closed again shortly afterwards.
Cornwall Wildlife Trust manage the quarry. Until very recently, the dense vegetation combined with very damp conditions made it impossible to access the quarry. The quarry is managed on the remaining part of a 25 year lease from Goonvean China Clay Company.
After studying the exposure, when you return to your car, you will spot low grade ore samples in the unmade road. Only the purest feldspar was used and the rest treated as waste.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
2 valid minerals.
Detailed Mineral List:
| ⓘ Cordierite Formula: (Mg,Fe)2Al3(AlSi5O18) |
| ⓘ Orthoclase Formula: K(AlSi3O8) |
| ⓘ 'Pinite' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 9 - Silicates | |||
|---|---|---|---|
| ⓘ | Cordierite | 9.CJ.10 | (Mg,Fe)2Al3(AlSi5O18) |
| ⓘ | Orthoclase | 9.FA.30 | K(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Pinite' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| O | ⓘ Orthoclase | K(AlSi3O8) |
| Mg | Magnesium | |
| Mg | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Al | Aluminium | |
| Al | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Al | ⓘ Orthoclase | K(AlSi3O8) |
| Si | Silicon | |
| Si | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Si | ⓘ Orthoclase | K(AlSi3O8) |
| K | Potassium | |
| K | ⓘ Orthoclase | K(AlSi3O8) |
| Fe | Iron | |
| Fe | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
Geochronology
| Geologic Time | Rocks, Minerals and Events | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | ||||||||||||||||||||||
| Paleozoic | ||||||||||||||||||||||
| Permian | ||||||||||||||||||||||
| Guadalupian |
| |||||||||||||||||||||
| Cisuralian |
| |||||||||||||||||||||
Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
- Rheno-Hercynian BeltOrogenic Belt
EuropeContinent
UK
- England
- Cornwall
- St Austell Mining DistrictMining District
- Devon and Cornwall metalliferous mining districtMining District
- Cornwall
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Tresayes Quarry, Trezaise, Roche, Cornwall, England, UK