Long-range communication stone

Communication stones were devices created by the Alterans before their society divided into the Ancients and the Ori. The stones, which require the ATA gene to be initialized, were capable of transmitting memories and thoughts psychically, either concious or not. Joe Spencer bought one of the stones at a garage sale, where the seller said that his grandfather had found it in an Egyptian archeological dig (presumably left behind by the Goa'uld). SG-1 found a stone when they travelled to P3R-233. The devices allowed Spencer and Jack O'Neill to view each others memories, but also caused Spencer to fixate on O'Neill and the events of SG-1, while O'Neill saw the events of Spencer's life&mdash;but didn't tell anyone as he found it relaxing..

After the intergalactic communication device was found in Merlin's vault in Avalon, Daniel Jackson realized that the stones could interface with the device. He and Vala Mal Doran placed the two stones into the terminal, which transported their minds to the Ori Home Galaxy&mdash;and alerting the Ori to the existence of Human life in the Milky Way.