Good post, but I question if the separation from heresy is schism.
"... So that if any presbyter or bishop or metropolitan dares to secede from communion with his own patriarch and does not mention his name as is ordered and appointed in the divine mystagogy, but before a synodical arraignment and his [the patriarch's] full condemnation, he creates a schism, the Holy Synod has decreed that this person be alienated from every priestly function, if only he be proven to have transgressed in this. These rules, therefore, have been sealed and ordered concerning those who on the pretext of some accusations against their own presidents stand apart, creating a schism and severing the unity of the Church. But as for those who on account of some heresy condemned by Holy Synods or Fathers sever themselves from communion with their president, that is, because he publicly preaches heresy and with bared head teaches it in the Church, such persons as these not only are not subject to canonical penalty for walling themselves off from communion with the so-called bishop before synodical clarification, but they shall be deemed worthy of due honor among the Orthodox. For not bishops, but false bishops and false teachers have they condemned, and they have not fragmented the Church's unity with schism, but from schisms and divisions have they earnestly sought to deliver the Church" " Canon XV of the First-Second Council of Constantinople (861 AD)