Oct 23 (Reuters) - Canada's main stock index touched its lowest in six months on Tuesday, tracking a slump in global markets on political worries and growth concerns and due to losses in energy stocks.
* At 9:38 a.m. ET (13:38 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 190.64 points, or 1.24 percent, at 15,222.06. The index was looking at its biggest daily percentage drop since two weeks ago.
* Canadian Prime Minister Justin Trudeau, under pressure to punish Saudi Arabia after the killing of journalist Jamal Khashoggi, said it would be very hard to scrap an arms deal with Riyadh worth up to $13 billion as critics have demanded. Global stocks slid towards their lowest level in a year as negative drivers from fatigued earnings and Saudi Arabia's diplomatic isolation to a brewing spat over Italy's finances piled on the pressure. GLOB/
* All of the index's 11 major sectors were trading in the red, led by a 2.9 percent drop in the energy sector .SPTTEN .
* U.S. crude CLc1 prices were down 2.4 percent a barrel, while Brent crude LCOc1 lost 2.4 percent as Saudi Arabia reassured it could supply more crude quickly if needed. O/R
* The materials sector .GSPTTMT , which includes precious and base metals miners and fertilizer companies, added 0.4 percent. Gold futures GCc1 rose 1.4 percent to $1,237.8 an ounce and palladium hit a record high as a risk-off sentiment boosted the demand for safe heaven assets. GOL/ MET/L
* The financials sector .SPTTFS slipped 1 percent. The industrials sector .GSPTTIN fell 1.8 percent.
* The largest percentage gainers on the TSX were Alamos Gold AGI.TO , which jumped 5.8 percent and Endeavour Mining EDV.TO , which rose 5.3 percent.
* Weed stocks extended their slide from Monday and led decliners with Aurora Cannabis ACB.TO down 11.1 percent and Aphria Inc APH.TO off 8.6 percent.
* On the TSX, 39 issues were higher, while 206 issues declined for a 5.28-to-1 ratio, with 27.57 million shares traded.
* The most heavily traded shares by volume were Aurora Cannabis ACB.TO , Hexo Corp HEXO.TO , and Aphria Inc APH.TO .
* The TSX posted no new 52-week highs and 26 new lows.
* Across all Canadian issues there were no new 52-week highs and 95 new lows, with total volume of 46.22 million shares.