The pfsrd states that,
whenever a magus casts a spell with a range of “touch” from the magus spell list, he can deliver the spell through any weapon he is wielding as part of a melee attack.
One of his magus arcana lets him make an energy touch attack, but it's a supernatural ability, not a spell per se. Does it still work with his Spellstrike ability? That is, can I deliver this energy attack through my weapon?