Thunder Egg Mt Hay Australia

Discover the Fascinating World of Thunder Eggs

Thunder eggs are geological wonders that captivate collectors and geologists alike with their stunning, colorful interiors. Formed millions of years ago, these unique specimens offer a glimpse into the Earth's volcanic past.

What is a Thunder Egg and How Do They Form?

Thunder eggs near Rockhampton, Mt. Hay in Queensland, were formed around 120 million years ago. A rhyolite shell formed around trapped gas bubbles when the molten lava cooled. This shell cracked, allowing the gases to escape and leaving behind a hollow cavity. Siliceous liquids with minerals and impurities entered the cavity and crystallized, sealing the cracks and forming colorful centers. These centers usually consist of agate, chalcedony, jasper, quartz crystal, or a combination of these minerals. Both "thunderegg" and "thunder egg" are correct spellings and can be used interchangeably.

Rare Volcanic Marvels with Unique Characteristics

These volcanic marvels are rare, found only in a few countries, and known by different names. The term "thunderegg" or "thunder egg" is thought to be of Native American origin, as they believed the thundereggs dropped from the sky during thunderstorms. In Europe, Mt. Hay Thundereggs are known by names such as "Amulet Stone" and "Star Agate." They are similar to agates, yet different.

Unique Features of Mt. Hay Thundereggs

In Australia, the Mt. Hay stones have unique characteristics. When polished on the outside, the partially exposed centers glow if held over a light. Picture #4 shows this specimen's appearance when lighted from the back, revealing its deep inner beauty.

Information About This Thunder Egg

Size: 69mm L X 63mm H X 8mm D, Weight: 59 grams. This Thunder Egg ships with a Certificate of Authenticity, tag, tag stand, and information about Thunder Eggs. The base and photo cube are not included. This Thunder Egg is not polished, has no odor (untreated), and is lightly sprayed for photographic purposes. Superb specimen!

Terrific for Jewelry or Display

This thunder egg is from the world's premier location, Mt. Hay, Queensland, Australia. It is cut flat on both sides, and the interesting crust can be seen easily. It is a dynamic, colorful specimen that can be easily made into jewelry or a terrific display specimen.