I guess the blame's on me, 'cause i tacked this on at the very end of the ability's description, in a place where one wouldn't think to look for it, but here's the extra info:

[quote]
As an auxiliary power, Quebra, at no cost, can transform parts of the armor into the same sort of crystal grown from his limbs, maximum toughness - the main reason to do this may be the fact that the [b]liquid provides no heat or electrical resistance[/b], unlike the crystal.
[/quote]

So it's pretty much anything but the legs/arms right now.