| Locality type: | Mine |
| Classification |
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| Species: | Marcasite |
| Formula: | FeS2 |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Marcasite data |
| Locality Data: | Click here to view Gwynfynydd Mine, Ganllwyd, Gwynedd, Wales, UK |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 18611 |
| Long-form Identifier: | 1:3:18611:5 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Marcasite |
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| 10.7km (6.7 miles) | ⓘDolgellau, Gwynedd, Wales, UK |
| 29.0km (18.0 miles) | ⓘBritannia Mine, Beddgelert, Gwynedd, Wales, UK |
| 29.8km (18.5 miles) | ⓘTonfanau Quarry, Llangelynin, Gwynedd, Wales, UK |
| 30.7km (19.1 miles) | ⓘCyffty Mine, Capel Curig, Conwy, Wales, UK |
| 31.9km (19.9 miles) | ⓘHafna Mine, Trefriw, Conwy, Wales, UK |
| 32.3km (20.1 miles) | ⓘParc Mine, Trefriw, Conwy, Wales, UK |
| 32.4km (20.1 miles) | ⓘBacheiddon Mine, Penegoes, Powys, Wales, UK |
| 37.0km (23.0 miles) | ⓘEsgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK |
| 37.5km (23.3 miles) | ⓘBrynarian Mine (Cardigan Bay Consols Mine), Tre-Taliesin, Llangynfelyn, Ceredigion, Wales, UK |
| 37.7km (23.5 miles) | ⓘBlaenceulan Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK |
| References |
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Gwynfynydd Mine, Ganllwyd, Gwynedd, Wales, UK