Thalmerite

Thalmerite is an explosive used several species and organizations, including Starfleet, the Klingons and the Cardassians.

In 2369, Hon-Tihl, first officer of the, planted a explosive device comprised of thalmerite near the reactor core of the starship when under the influence of the Saltah'na energy spheres. The device ignited and destroyed the Toh'Kaht near Deep Space 9. 

In 2371, Gul Dulcet placed thalmerite explosive devices at several locations around the mining camp he oversaw. The USS Defiant (NX-74205) (I) was able to rescue the Maquis and Cardassianss in the camp before the devices exploded. 

The USS Voyager possessed quantities of thalmerite.