* TSX falls 59.54 points, or 0.47 percent, to 12,529.55 * Five of 10 main sectors decline * Gold shares shed 2.5 percent * BlackBerry gains, lifting technology sector * Silver Wheaton slips after results By John Tilak TORONTO, May 13 (Reuters) - Canada's main stock index declined on Monday after sluggish Chinese economic data hurt commodity prices and dampened enthusiasm for shares of materials and energy companies. China's factory output growth was surprisingly feeble in April and fixed-asset investment slowed, rekindling concerns that the recovery is stalling. The resource-heavy Toronto market is sensitive to developments in China, a big consumer of commodities from Canada, because of its large exposure to materials and energy stocks. An unexpected rise in U.S. retail sales in April failed to lift sentiment. "Any hint of weakness in China does not help export-focused markets like Canada and Australia," said Matt Skipp, president of SW8 Asset Management. "Before committing any money on the long side at the moment, I want to see what this very significant commodity weakness is telling us about the global economy," he added. The Toronto Stock Exchange's S&P/TSX composite index closed down 59.54 points, or 0.47 percent, at 12,529.55. "There's a tremendous amount of nervousness in the markets," said Sal Masionis, a stockbroker at Brant Securities. "People don't have confidence," he added. "Interest rates are low, there's lots of money out there, but there's nowhere to go." Five of the 10 main sectors on the index were in the red. The materials sector, which includes mining stocks, lost 2.1 percent as gold stocks shed 2.5 percent. Bullion prices fell about 1 percent as the U.S. dollar firmed on signs of an improving economy and as holdings in exchange-traded funds slipped. Miner Barrick Gold Corp gave back 2.9 percent to C$20.50 and was the biggest negative influence on the market. Silver Wheaton Corp's first-quarter earnings came in slightly below expectations and the company changed its dividend policy to tie the payout to performance over a whole year. The stock fell 3.5 percent. The price of oil slipped, pulling energy shares down 0.6 percent. Financials, the index's most heavily weighted sector, was down 0.2 percent. BlackBerry gained 2.1 percent to C$16.04, helping lift the information technology sector up 0.7 percent.