Toranium

Toranium was an extremely strong metal used in Cardassian construction such as on Deep Space 9. Standard phasers were ineffective at cutting through toranium inlays and a bipolar torch was recommended. 

When the USS Defiant (2370) posed as the Kobheerian freighter Rak-Miunis, Benjamin Sisko claimed that they were carrying Kobheerian toranium intended for military use on Cardassia Prime. 

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Toranium