Craving Baked CLAY while pregnant! Healthy?

So back in Ghana where I'm from originally, we have this type of clay called ayilo! It's gray in color and baked before consumed/sold. I used to hear people say it's bad but I've done some research on eating clay and it seems to contain some healthy minerals! Havnt heard of any bad medical conditions association with it's consumption. Do you have this craving? What are your thoughts? Thanks