Hutzelite 27
From Star Trek : Freedom's Wiki
Hutzelite 27 is one of many explosive materials available to the crew of the USS Enterprise-D in 2367 when they were trapped in a Tyken's Rift.
According to the database, this material is a "plutonium derivative treated to minimize toxicity for humanoid lifeforms. Used for radioisotope source and certain bio-medical and therapeutic applications." (TNG: "Night Terrors")
