Thunder egg 10-15mm oval flat beads (ETB01139) Pinolith Moonstone calms and encourages

Moonstone calms and encourages

5 x 29 x 7

opal cutters need to leave the ironstone on the back of the opal to form a full sized stone

as it depends on what the type of other mineral it is included in

but slicing them in half and polishing them may reveal intricate patterns and colors

Thunder egg 10-15mm oval flat beads (ETB01139) Pinolith Moonstone calms and encouragesThunderegg A thunderegg (or thunder egg) is a nodule like geological structure, similar to a geode, that is formed within a rhyolitic lava flow. Thundereggs are rough spheres, most about the size of a baseballthough they can range from less than an inch to over a meter across. They usually contain centres of chalcedony in the form of agate, jasper or opal,[1] either uniquely or in combination. Also frequently encountered are quartz and selenite