The Standard & Poor’s GSCI gauge of 24 raw materials fell 0.7 percent to settle at 588.17 at 3:51 p.m. in New York, led by cotton.
The UBS Bloomberg CMCI index of 26 prices declined 0.8 percent to 1,432.13.
Cotton futures fell the most in a week on concern that Europe’s debt woes and a faltering global economy will erode fiber demand amid signs that supply will be ample.
Spain is poised to become the fourth of the 17 euro-area countries to require emergency assistance, while German exports dropped and Italian industrial output shrank. Output in the U.S., the top exporter, will be 17.63 million bales in the year starting Aug. 1, up from 17 million estimated by the government last month, according to a Bloomberg survey.
On ICE Futures U.S. in New York, cotton for December delivery slumped 3.3 percent to 69.88 cents a pound, the biggest drop for a most-active contract since June 1.
Raw-sugar futures for July delivery climbed 1.1 percent to 19.98 cents a pound.
Arabica-coffee futures for July delivery declined 0.7 percent to $1.556 a pound.
Cocoa futures for September delivery fell 1 percent to $2,185 a ton in New York.
Orange-juice futures for July delivery dropped 1.7 percent to $1.1365 a pound, the biggest decline since May 23.
Copper futures fell the most in two weeks after Federal Reserve Chairman Ben S. Bernanke damped expectations of additional U.S. economic stimulus.
On the Comex in New York, copper futures for July delivery tumbled 2.5 percent to $3.285 a pound, the biggest drop for a most-active contract since May 23. This week, the metal fell 0.9 percent, marking the sixth straight decline, the longest slump since May 2010.
On the London Metal Exchange, copper for delivery in three months dropped 2.7 percent to $7,295 a metric ton ($3.31 a pound).
Gold gained for the third time in four days amid expectations that Spain may receive emergency assistance over the weekend.
On the Comex, gold futures for August delivery climbed 0.2 percent to $1,591.40 an ounce, trimming the weekly loss to 1.9 percent.
Silver futures for July delivery slid 0.2 percent to $28.471 an ounce on the Comex, declining 0.1 percent this week.
On the New York Mercantile Exchange, platinum futures for July delivery fell 1.1 percent to $1,425.10 an ounce. Palladium futures for September delivery dropped 2.2 percent to $612 an ounce.
Crude oil pared losses on the possibility that discussions by European finance officials this weekend would yield a bailout for Spain.
On the New York Mercantile Exchange, oil futures for July delivery fell 0.8 percent to $84.10 a barrel. Earlier, the price dropped as much as 3.3 percent. This week, the commodity rose 1 percent, snapping a five-week slump.
Trafigura Beheer BV failed to sell two cargoes of North Sea Forties blend at lower prices than yesterday. Eni SpA bought Russian Urals at a bigger discount to dated Brent than the last trade in the Mediterranean.
Daily exports of Azeri Light crude from a port in Turkey will increase by 1 percent in July from June, according to a loading program obtained by Bloomberg News.
Gasoline posted the largest weekly gain since April amid optimism that policy makers in Europe, China and the U.S. will act to stimulate their economies.
On the Nymex, gasoline for July delivery, little changed today at $2.6852 a gallon, climbed 1.1 percent this week, the most since late April.
Heating-oil futures for July delivery rose 0.2 percent to $2.6721 a gallon.
Natural gas gained for the first time in three days amid forecasts for above-normal temperatures that may signal higher demand for the power-plant fuel.
On the Nymex, gas futures for July delivery rose 1.1 percent to $2.299 per million British thermal units.
U.K. gas for the next working day was little changed as higher demand was met by increased flows from liquefied natural gas terminals.
Gas was at 55.2 pence a therm at 4:15 p.m. London time. That’s equivalent to $8.52 per million Btu. A therm is 100,000 Btu,
Wheat dropped on speculation that yields in Kansas, the biggest U.S. producer of winter varieties, will increase, while the pace of the harvest was faster than normal.
On the Chicago Board of Trade, wheat futures for July delivery slid 1.8 percent to $6.3025 a bushel.
Soybean futures for November delivery dropped 0.7 percent to $13.325 a bushel.
Corn futures for July delivery advanced 0.7 percent to $5.98 a bushel. The price gained 8.4 percent this week.
Hog futures fell for the first time in four days on speculation that demand from U.S. meat processors will slow after prices rallied 12 percent in almost five weeks.
On the Chicago Mercantile Exchange, hog futures for July settlement slid 0.4 percent to 92.925 cents a pound. The price gained 1.5 percent this week.
Cattle futures for August delivery gained 0.3 percent to $1.20825 a pound, advancing 1 percent this week.
Feeder-cattle futures for August settlement rose 0.2 percent to $1.59375 a pound.
-- With assistance from Matthew Brown and Sherry Su in London; Tony C. Dreibus and Jeff Wilson in Chicago; Debarati Roy, Moming Zhou, Christine Buurma, Marvin G. Perez and Joe Richter in New York; and Barbara J. Powell in Dallas. Editors: Thomas Galatola, Patrick McKiernan
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