This is a trilobite fossil. It's been in my house since I was a child, so I have no details about it. The size of the entire stone is approximately: Height: 6.5-7 cm Width: 10-11 cm Depth: 12-13 cm The trilobite part is approximately: Depth: 10 cm Width: 7-8 cm (at the widest point) Measurements are difficult, so please forgive any errors. The cloth underneath is not included.