Mexican Opal freeform pendants (ETP00219) Style:B The oxides which form plume

The oxides which form plume and other inclusions are quite common

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Bryozoan Coral 13-14mm round beads (ETB00887)

Size: 39 x 43 x 9

Mexican Opal freeform pendants (ETP00219) Style:B The oxides which form plumeMexican 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