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This is a short overview. For the background — history, value over time and notable mines — see Feldspar →
A rock-forming aluminium silicate mineral, crushed and used as a flux and glaze ingredient in ceramics and glassmaking; feldspar and kaolin deposits at Larkhill, County Fermanagh, supplied the Belleek Pottery from the 1850s.
| Mine | Region | Worked |
|---|---|---|
| Castlecaldwell Feldspar Mine | County Fermanagh | 1853–1940s (last feldspar working) |
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