J.S. Mason - Central Wales
||Pyrrhotite is very rare in Central
Wales. These samples are from Erglodd mine and reveal the fresh mineral
forming euhedral to subhedral brown aggregates in early galena, and its
decay. Pyrrhotite decay is often quite impressive - the texture reminds
me of the foliage hanging over a mangrove swamp. The only other
pyrrhotite locality in Central Wales is Dylife mine, in the orefield's
NE sector, where a few samples have been found over the years. Here, it
forms part of the later mineralisation. With two, poorly understood and
paragenetically different occurences, pyrrhotite in Central Wales will
remain as a bit of an oddball.
pyrrhotite is a major and widespread sulphide in the pre-Acadian
metalliferous vein suites of the Dolgellau Gold-belt and the Snowdon
Caldera, both to the north of Central Wales.
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