Organic Rocks are found scattered throughout the world. They look like actual rock formations, and can be harvested with your build gun. They only drop one unit per rock.
They can be found all throughout the undergrounds. On the surface, they are rare, but possible. However, they can be easily found in the areas where Tunnel Nuker have exploded. head NE SE SW or NW of your cph (diagonally away from the CPH). Also found near Overminds.Camobots also drops between 1-4 of these rocks these can easily be found in the frozen cavern.