  We introduce a model for matters-genesis in which both the baryonic and dark
matter asymmetries originate from a first-order phase transition in a dark
sector with an $SU(3)\times SU(2)\times U(1)$ gauge group and minimal matter
content. In the simplest scenario, we predict that dark matter is a dark
antineutron with mass either $m_{\bar{n}} = 1.36$ GeV or $m_{\bar{n}} = 1.63$
GeV. Alternatively, dark matter may be comprised of equal numbers of dark
antiprotons and pions. This model, in either scenario, is highly discoverable
through both dark matter direct detection and dark photon search experiments.
The strong dark matter self interactions may ameliorate small-scale structure
problems, while the strongly first-order phase transition may be confirmed at
future gravitational wave observatories.
