Hand carved lava statue

This was found in a box bought at an Estate sale 10 years ago. The Estate was for and edlerly couple that had a history of extensive travel all over the world. It seems to be made of lava rock. The head is oversized and the face is sunken in, the back of the head is extended out. The ears are carved out, the eyes are sunken in with pupils. I have been unable to find anything that looks like it and I don't know what country or culture it is from.