LONDON, June 12 (Reuters) - European shares looked set to open mixed on Tuesday after the initial euphoria over a rescue package for debt-stricken Spanish banks faded, with investors jittery the crisis will spread throughout the euro zone. Futures for Euro STOXX 50 and France's CAC were up 0.2 percent, while futures for Germany's DAX fell 0.1 percent by 0634 GMT. Financial spreadbetters earlier expected Britain's FTSE 100 to shed about 0.1 percent. After weeks of nervousness, the move