Phylite with quartz crystals, Oriel Ynys Môn
Geological specimens, Oriel Ynys Môn
Jasper and quartz, Oriel Ynys Môn
Purbeck marble from Dorset, Oriel Ynys Môn
Polished ophicalcite from Llanfechell, in the...
Polished ophicalcite, Oriel Ynys Môn
Copper crystals, Oriel Ynys Môn
Chalcopyrite, Oriel Ynys Môn
Jana Horak, Oriel Ynys Môn
