A glass curtain wall connective support system that includes a connective aluminum shape with an integral slot, which is configured to index with an outer facing leg or projection from a curtain wall frame support structure. The connective aluminum shape is bonded to a glass pane assembly, preferably under factory conditions. The curtain wall frame support structure is affixed to a secure structural element of a building. The glass pane assembly, bonded with the connective aluminum shape, is then indexed with the curtain wall frame support structure, and then secured with one or more snap clamps. The connective aluminum shape provides a rapid and secure attachment for a plurality of glass panes to a curtain wall frame supporting structure.