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

Sphalerite, ZnS, and Quartz, SiO2. Bryn y Rafr mine, west Wales. Several layers of sphalerite separated by quartz. There are no observable crystals in the sphalerite or the quartz. The quartz has reddish colour, which is probably from iron staining.  

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