Vaguely tribal looking composite or tribal stone?

I’m leaning towards former but if not I want to know what this is? It’s not mine it’s just being sold locally. Looks like air bubbles and stone composite type material but could be some volcanicy type stone I am unfamiliar with. Looks more formed/molded than carved too. However if it were volcanic stone and just time worn it may look like this I suppose. I’ve had Mexican volcanic type stone carvings before that were not entirely different. The face seems pretty generic too. Anyways any thoughts?