Twll Maen Grisial, Fron Olau, Prenteg, Dolbenmaen, Gwynedd, Wales, UKi
| Regional Level Types | |
|---|---|
| Twll Maen Grisial | Cliff (Dormant) |
| Fron Olau | - not defined - |
| Prenteg | Hamlet |
| Dolbenmaen | Community |
| Gwynedd | County |
| Wales | Country |
| UK | Country |
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Latitude & Longitude (WGS84):
52° 56' 53'' North , 4° 6' 47'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SH582410
Type:
Cliff (Dormant) - last checked 2020
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Porthmadog | 2,981 (2017) | 2.4km |
| Penrhyndeudraeth | 1,546 (2017) | 3.5km |
| Criccieth | 1,753 (2017) | 8.7km |
| Garndolbenmaen | 101 (2012) | 9.0km |
| Harlech | 1,762 (2017) | 9.9km |
Mindat Locality ID:
4279
Long-form identifier:
mindat:1:2:4279:9
GUID (UUID V4):
f4198731-8f30-40a2-9117-9784e91db0fc
Other/historical names associated with this locality:
Caernarvonshire
Brookite from this location was originally referred to as being from "near Snowdon" by Sowerby (1809), but this was later confirmed by Sowerby (1838) to be Prenteg. Also incorrectly called "Fonolen" by Greg and Lettsom (1858) and elsewhere described as "8 miles from Snowdon, between Beddgelert and Tremadoc".
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
16 valid minerals. 1 (TL) - type locality of valid minerals.
Detailed Mineral List:
| β Albite Formula: Na(AlSi3O8) |
| β Anatase Formula: TiO2 |
| β Brookite (TL) Formula: TiO2 Type Locality: |
| β Calcite Formula: CaCO3 |
| β Chamosite Formula: (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| β Fluorapatite Formula: Ca5(PO4)3F |
| β Galena Formula: PbS |
| β Goethite Formula: Ξ±-Fe3+O(OH) |
| β Halloysite Formula: Al2(Si2O5)(OH)4 |
| β Hydrohalloysite Formula: Al2Si2O5(OH)4 · 2H2O |
| β Ilmenite Formula: Fe2+TiO3 |
| β Monazite-(Ce) Formula: Ce(PO4) |
| β Pyrite Formula: FeS2 |
| β Quartz Formula: SiO2 |
| β Rutile Formula: TiO2 |
| β Titanite Formula: CaTi(SiO4)O |
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| β | Galena | 2.CD.10 | PbS |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Goethite | 4.00. | Ξ±-Fe3+O(OH) |
| β | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| β | Quartz | 4.DA.05 | SiO2 |
| β | Rutile | 4.DB.05 | TiO2 |
| β | Anatase | 4.DD.05 | TiO2 |
| β | Brookite (TL) | 4.DD.10 | TiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Calcite | 5.AB.05 | CaCO3 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| β | Monazite-(Ce) | 8.AD.50 | Ce(PO4) |
| β | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| β | Titanite | 9.AG.15 | CaTi(SiO4)O |
| β | Chamosite | 9.EC.55 | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| β | Halloysite | 9.ED.10 | Al2(Si2O5)(OH)4 |
| β | Hydrohalloysite | 9.ED.10 | Al2Si2O5(OH)4 Β· 2H2O |
| β | Albite | 9.FA.35 | Na(AlSi3O8) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| H | β Goethite | Ξ±-Fe3+O(OH) |
| H | β Halloysite | Al2(Si2O5)(OH)4 |
| H | β Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O |
| C | Carbon | |
| C | β Calcite | CaCO3 |
| O | Oxygen | |
| O | β Albite | Na(AlSi3O8) |
| O | β Anatase | TiO2 |
| O | β Brookite | TiO2 |
| O | β Calcite | CaCO3 |
| O | β Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| O | β Fluorapatite | Ca5(PO4)3F |
| O | β Goethite | Ξ±-Fe3+O(OH) |
| O | β Halloysite | Al2(Si2O5)(OH)4 |
| O | β Ilmenite | Fe2+TiO3 |
| O | β Monazite-(Ce) | Ce(PO4) |
| O | β Quartz | SiO2 |
| O | β Rutile | TiO2 |
| O | β Titanite | CaTi(SiO4)O |
| O | β Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O |
| F | Fluorine | |
| F | β Fluorapatite | Ca5(PO4)3F |
| Na | Sodium | |
| Na | β Albite | Na(AlSi3O8) |
| Al | Aluminium | |
| Al | β Albite | Na(AlSi3O8) |
| Al | β Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| Al | β Halloysite | Al2(Si2O5)(OH)4 |
| Al | β Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O |
| Si | Silicon | |
| Si | β Albite | Na(AlSi3O8) |
| Si | β Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| Si | β Halloysite | Al2(Si2O5)(OH)4 |
| Si | β Quartz | SiO2 |
| Si | β Titanite | CaTi(SiO4)O |
| Si | β Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O |
| P | Phosphorus | |
| P | β Fluorapatite | Ca5(PO4)3F |
| P | β Monazite-(Ce) | Ce(PO4) |
| S | Sulfur | |
| S | β Galena | PbS |
| S | β Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | β Calcite | CaCO3 |
| Ca | β Fluorapatite | Ca5(PO4)3F |
| Ca | β Titanite | CaTi(SiO4)O |
| Ti | Titanium | |
| Ti | β Anatase | TiO2 |
| Ti | β Brookite | TiO2 |
| Ti | β Ilmenite | Fe2+TiO3 |
| Ti | β Rutile | TiO2 |
| Ti | β Titanite | CaTi(SiO4)O |
| Fe | Iron | |
| Fe | β Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
| Fe | β Goethite | Ξ±-Fe3+O(OH) |
| Fe | β Ilmenite | Fe2+TiO3 |
| Fe | β Pyrite | FeS2 |
| Ce | Cerium | |
| Ce | β Monazite-(Ce) | Ce(PO4) |
| Pb | Lead | |
| Pb | β Galena | PbS |
Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK
- Wales
- Cambrian MountainsMountain Range
- Snowdonia National ParkNational Park
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References
