After posting a query at the Lurker Lounge, I was pointed to these two websites.
This Affix List is, apparently, accurate about what sorts of charged skills can occur on different items, but is incomplete about what levels and numbers of charges the items can get.
This Affix Calculator will list for any input item what sorts of affixes can occur on it, including spell charges, but is inaccurate about what spell level the charges can get.
So, it looks like Ice Bolt is possible. Now to find it.......
This Affix List is, apparently, accurate about what sorts of charged skills can occur on different items, but is incomplete about what levels and numbers of charges the items can get.
This Affix Calculator will list for any input item what sorts of affixes can occur on it, including spell charges, but is inaccurate about what spell level the charges can get.
So, it looks like Ice Bolt is possible. Now to find it.......
"Last seen wandering vaguely, quite of her own accord"