Thunderegg-Adjacent Stones

These are stones that aren't thundereggs, yet were still interesting enough to me to want to present here. They include wide-ranging other types of nodule, stones that are related to thundereggs, stones that happen to look similar to thundereggs, and even just specimens that happened to tickle my obsession! They are useful for comparison purposes, as well as showcasing just how many different kinds of "stones with holes in" and "blobs of stuff surrounded by other stuff" there are in the world. There is nothing comprehensive about these, of course - this is just a repository for stones that I happened to acquire. Sometimes I know what they are - sometimes I don't.

See also Other Specimens and Flints for more stones that happen not to be thundereggs!

Sandstone Nodule with Quartz from Remiremont, France	Emirler Village Rhyolite Transitional Nodules	Glendonite in Sandstone Concretion - Calcite Pseudomorph After Ikaite
Fossil Sponge in Chalcedony in a Flint Nodule	Hollow Flint with a Cavity that Formed around a Fossil Sponge	Possible Phosphatic Nodule with Fossil Sponge
	Large, Pale Black Sea Nodular Mass with Red Agate	Large Single Nodule of Yenisofça / Eskişehir Opal, Turkey
Yenisofça / Eskişehir Opal Nodule, Turkey	Green Hydrothermally Altered Basalt with Epidote from Almus Village, Turkey	Azurite Nodule/Geode
Mystery Red and White Black Sea Specimen - Possible Fern Fossil	Colourful Unknown Nodule - Very Possibly Not Rhyolite	A Pisolitic Nodule from Utah
Beautiful Septarian Nodule from Morocco	Classic Septarian Nodule from Morocco	Leopardskin Spherulitic Rhyolite
Unknown Spherulitic Rhyolite	Keokuk Geode with White Band	Feathery Plume Agate Mass from the Almus Dam Bed, Tokat, Turkey