| Locality type: | Downs |
| Classification |
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| Species: | 'Biotite' (not an IMA approved species) |
| Formula: | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Biotite data |
| Locality Data: | Click here to view Trelavour Downs, St Dennis, Cornwall, England, UK |
| Photo Gallery | View Gallery (3 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 1999 |
| Long-form Identifier: | 1:3:1999:6 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 4.4km (2.7 miles) | ⓘGunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK |
| 4.7km (2.9 miles) | ⓘDyer's Quarry, Chytane, St Enoder, Cornwall, England, UK |
| 9.2km (5.7 miles) | ⓘBodelva Pit (Carvear China Clay Works), Bodelva, St Blaise, Cornwall, England, UK |
| 28.8km (17.9 miles) | ⓘLushington Cove, Porthtowan, St Agnes, Cornwall, England, UK |
| 29.1km (18.1 miles) | ⓘPendennis Head, Falmouth, Cornwall, England, UK |
| 32.4km (20.1 miles) | ⓘCraddock Moor Mine, Craddock Moor, St Cleer, Cornwall, England, UK |
| 33.2km (20.6 miles) | ⓘSouth Caradon Mine, Caradon Hill, St Cleer, Cornwall, England, UK |
| 33.2km (20.6 miles) | ⓘCheesewring Quarry, Minions, Linkinhorne, Cornwall, England, UK |
| 33.8km (21.0 miles) | ⓘSouth Crofty Mine, Pool, Carn Brea, Cornwall, England, UK |
| 34.6km (21.5 miles) | ⓘEast Wheal Grenville, Grenville United Mines, Troon, Camborne, Cornwall, England, UK |
| References |
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Trelavour Downs, St Dennis, Cornwall, England, UK