I work at a local primary school in Essex and one of the children brought this object in. His mother came across whilst digging in the garden! I am not sure what it is. can you help please? The two photos show two of the surfaces. It measures approximately 8 x 5 x 3cm and weighs 67g. Fairly light due to the hollow pipework type structure. Not even sure if it is man made! I have cleaned it up using a toothebrush but some soil still remains. It feels like a rocy substance.