Britain's FTSE 100 index is seen opening 39 points lower at 7,118 on Friday, according to financial bookmakers. * GLENCORE: Ivan Glasenberg, head of Glencore, will no longer be a member of the board of Russian oil major Rosneft, Rosneft board meeting minutes showed on Thursday. * RIO TINTO: Global miner Rio Tinto said on Friday that its $1.9 billion Amrun bauxite mine in northern Australia is set to enter full production after finishing its ramp-up phase, boos