  We study the decays of a scalar \stst\ bound state \sigst, where \st\ is the
lighter stop eigenstate. If \st\ has no tree--level 2--body decays, the
dominant decay modes of \sigst\ are $gg$ or, if $m_h < \mst \ll \mstt$, a pair
of light scalar Higgs bosons $h$. The best signal for \sigst\ production at
hadron colliders is probably its decay into two photons.
