This rock, which is about the size of a large orange and weighs about a kilo, (2.2 pounds) was collected for me while the family were out looking for ‘thunder eggs’. A common activity in Northern NSW and southern Queensland.

While this one hasn’t got the simple perfection of the much covetted ‘real’ thunder eggs, I like it because it is so complex inside the nodule.

In places there look to be more than a dozen layers. Thicker and also leaf-thin. There are a couple of crystals according to the errant glitter, and areas that look like spongy bone marrow.

The outside appears to be covered with a layer of fossilised clay. There does look to be some soil encrusted in the inside but I could be wrong. I will wash it and see.