Minerals / Hydraulic brecciation, Bryn y Rafr. (CWO)

Bryn y Rafr mine, West Wales. Typical brecciated material from this site, which is a mix of host rock, Quartz, and Sphalerite. The host rock is a fine grained dark mudstone. Brecciation is the result of inwardly exploding walls of deep fractures when there is a sudden decrease of pressure in the hot mineral rich fluids which are circulating through the fracture. 

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