This is one of the most dangerous nuclear weapons ever conceived*. Rather than packing a very explosive punch, it bores through solid rock until its nuclear fuel is spent. Packed with enough fuel, and aimed at the planet's core, it can reach the center and cause the entire planet to rupture.
When it goes off, a Stone Burner releases a particular type of radiation that mostly affects eye tissue. The extremely high levels of heat and radiation actually eats away the flesh of the eyes, leaving nothing but empty eye sockets for anyone caught in the vicinity of the blast. It is effective for neutralizing forces in a wide radius**.
*By the humans of the future portrayed in Frank Herbert's Dune saga. **The Tleilaxu will sell many eyes in that case. Paul Muad'dib was blinded by a Stone Burner.