Found it interesting that when I did a search for armour that adds to earth skills could only find epic items.
Have just started building a pure Pyromancer and was hoping to find in the items database some Legendary purple items that would add to Earth skills....found only a few.
Two of which are melee based (heaphastus mace and shield) and one staff (which adds 2 skill points and which I am definately going to look out for).
Will make my build a lot more reliant on generic caster purple items now I have to admit....but then again can be seen as a potential to be more creative I guess.
Decided to go the caster way (volcanic orb and eruption) with the golem as pet and stone form as my recovery spell.