Halkan
The Halkans were a humanoid civilization with the unusual quality of having a history of total peace. In 2267, the Halkans refused to open negotiations with the Federation to allow them to mine dilithium from their planet, out of fear that one day these materials would be used for acts of violence.

The Halkans of the mirror universe were also a peaceful race, who preferred to die rather than allow their dilithium to be taken by the Terran Empire. ()

List of Halkans 
 Tharn
 Tharn (mirror)
 Unnamed Halkans

External link 
 

de:Halkanier
fr:Halkan
mu:Halkan
Species
Mirror universe