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A thunderegg (or thunder egg) is a nodule-like geological structure
5 - 35 x 26 x 5 mm
largest bead: 26mm (w) x 32mm (h) x 17mm (d)
5 and is very durable
Mexican Opal freeform pendants (ETP00217) Style:B A thunderegg (or thunder egg)Mexican Opal Cantera opal These stones are comparable to Australian boulder opal and its origins are similar. These are found as small pockets or seams veins of opal associated with rhyolite matrix, the host rock, which is softer than the opal. The word cantera refers to the host matrix. Like boulder opal and koroit opal, these stones were not initially as prized as the pure cuts but cutters and buyers of both koroit boulder and cantera opal came to
