Minerals / Marcasite, Bry y Rafr. (CWO)

Marcaste, FeS2. Bryn y Rafr mine, West Wales. Two halves of a broken specimen. The marcasite is in massive form with no crystals apparent, and with a pale yellow colour. This mineral is very susceptible to "pyrite decay" and the specimen is kept in a sealed plastic box with a plentiful supply of silica sachets.

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