Minerals / Quartz, Net veining, Bryn y Rafr. (CWO)

Quartz, SiO2. Bryn y Rafr mine, west Wales. An example of net veining on a small scale. The host rock does seem to be composed of two slightly different rocks. The difference in composition would encourage net veining, which in this case is quartz veining. There is a small area of very fine druzy quartz on the surface.

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