Nov 13 (Reuters) - Canada’s main stock index opened higher on Friday, recovering from the previous session, helped by gains in the materials sector. * At 9:30 a.m. ET (14:30 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 97.31 points, or 0.59%, at 16,679.49. (Reporting by Amal S in Bengaluru; Editing by Vinay Dwivedi)