Blue Stone

a material found only on the planet Beta Blue which later became the location of Hell Colony . Significant primarily in the HomeWorld Series. Paragangians had tried to mine it to make dream stone out of it but found it to not be suitable for this and abandoned the mining of Bets Blue. they did not realize the danger of this technology[typical of Paragangian approach to technology] and gave the planet they no longer had any use for to america in exchange for the land in Mexico where ESM was built. 
it is closely related to Living Stone --found only on HomeWorld and Dream Stone , found only on the blue moon Aissis , Teran 8 and the planet Paragangia .
this material can be used to create mind controlling objects giving the creator of the object some sort of control over the wearer of the object. BLue stone objects significant in the story