New Zealand Thunder Egg Necklace Ref 0013

New Zealand thunder eggs are rare, sought-after volcanic nodules found in specific regions, such as the South Island. These rough-looking nodules contain hidden, intricate patterns of agate, jasper, or druzy quartz formed over millions of years — they form in rhyolitic volcanic ash.

They are generally rough spheres that, when cut and polished, reveal vibrant, complex starburst patterns, found often in areas with silica-rich water that deposits crystals into voids.

Thunder eggs are not very common in New Zealand compared to other localities worldwide, making them prized pieces for collectors.