Uridium
From Star Trek : Freedom's Wiki
Uridium is an unstable mineral used in Cardassian ship construction. Generally, uridium alloy is used in their ship's sensor arrays. (DS9: "Indiscretion")
In its raw form, uridium can explode if exposed to an electrical charge. The Cardassian mining station Terok Nor was used to extract and process uridium from Bajor during the Cardassian Occupation. (DS9: "Civil Defense")
