Rocks?!

These are the Moeraki Boulders which can be found on NZ's Otago coasy between Timaru and Dunedin! They are spherical boulders of mudstone and range in size between 18" and 7'!! There are large cracks across the boulders which are lined with calcite and it's along these cracks that they eventually fall apart and look like Dino eggs I think! Absolutely fascinating!