Rare prehistoric Trilobite* fossil, most certainly from Morocco.
This fossil is in its juice.
Please note: accidents and wear and tear, look carefully at the photos.
* Trilobites (Trilobita) are extinct fossil marine arthropods that existed during the Paleozoic (primary era) from the Cambrian to the Permian. The last trilobites disappeared during the mass extinction at the end of the Permian, 250 Ma ago.