Are thunder eggs opals?
Are thunder eggs opals?
Thunder Eggs are usually filled with agate, chalcedony, opal, and/or visibly crystalline quartz.
Are thunder eggs rare?
A Thunder Egg is a rare concretion of iron ore found in Muddy Creek, a tributary of the Greenbrier River.
Are thunder eggs worth anything?
How Much Are Thundereggs Worth? A value of a cut in half and polished thunderegg depends on the size and its fillings and range from a few to a hundred dollars. Specimens with scenic moss or plumes looking like plants or flowers are among the most valuable eggs and can cost up to $200.
How do you tell if a rock is a thunder egg?
A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. Thundereggs are rough spheres, most about the size of a baseball—though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across.
How do you tell a geode from a thunder egg?
Thunder eggs, which are technically known as lithophysae are typically found with solid or near-solid cores of chalcedony or agate, whereas geodes are relatively hollow inside with thinner layers of quartz crystals. This smaller geode has a quartz crystal centre with a small amount of amethyst colouring.
Is a thunder egg an agate?
Thundereggs are agate-filled nodules found in various parts of the Western United States. They range in size from 1/4 inch to as large as 5 feet in diameter. Generally, they are about the size of oranges. All are similar on the exterior, but no two are alike in pattern, design or color on the inside.
