Minerals / Quartz, (Druzy), Bryn y Rafr. (CWO)

 Quartz, SiO2. Bryn y Rafr mine, Central Wales Orefield. A specimen composed of druzy quartz, with a small surface deposit of haematite. The composition implies that this was a brecciation out of which the host rock has been removed by weathering. The haematite is minimal and appears to be a later deposition.

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