i Have seen the same white stuff on my jade leaves , it seemed to be salt that the plant was expelling through pores. check
http://www.gardeningknowhow.co...
they went outside and it stoped happening after a few rains, did not seem to hurt jade,
here is silver dollar jade showing pores red in sunlight, these where white, as were the leaves on my regular jade but not my hobbit jade, ( in same pot as reg jade )
