| Locality type: | Mine |
| Classification |
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| Species: | Mattheddleite |
| Formula: | Pb5(SiO4)1.5(SO4)1.5(Cl,OH) |
| Comments: | Colourless prismatic crystals to 0.25mm with susannite, caledonite (XRD). |
| Habit: | Prismatic |
| Colour: | Colourless |
| Abundance at site: | Very Rare |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | XRD |
| Confirmation Details: | Where Tested and Reference ID: Leeds University, UK |
| Associated Minerals: |
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| Associates: | Caledonite
Susannite
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| Associated Minerals Based on Photo Data: |
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| Caledonite | 1 |
| Data |
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| Mineral Data: | Click here to view Mattheddleite data |
| Locality Data: | Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK |
| Photo Gallery | View Gallery (2 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 18309 |
| Long-form Identifier: | 1:3:18309:3 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Mattheddleite |
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| 4.7km (2.9 miles) | ⓘHendre Felen Mine (Hendre quarry), Ysbyty Ystwyth, Ceredigion, Wales, UK |
| 6.1km (3.8 miles) | ⓘEsgair Mwyn Mine, Ysbyty Ystwyth, Ceredigion, Wales, UK |
| 9.7km (6.0 miles) | ⓘDaren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK |
| 11.2km (6.9 miles) | ⓘLlechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK |
| 13.5km (8.4 miles) | ⓘBwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK |
| 14.9km (9.2 miles) | ⓘEaglebrook Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK |
| 16.9km (10.5 miles) | ⓘEsgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK |
| 98.9km (61.4 miles) | ⓘMachen quarry, Machen, Caerphilly, Wales, UK |
| References |
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Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK