By Barbara Kollmeyer
MADRID (MarketWatch) -- Commodity prices dropped on Tuesday as U.S. stock-market futures fell sharply, mirroring losses seen in European stock markets. A slew of earnings news was hitting the market early, including a profit tumble for DuPont DD -5.55% , which also cut its full-year outlook. Crude-oil for December delivery CLZ2 -1.41% tumbled $1.11, or 1.3%, to $87.54 a barrel, while gold for December delivery GCZ2 -0.95% slid $14, or 0.8%, to $1,712.20 an ounce. Silver for December delivery SIZ2 -1.36% sank 45 cents, or 1.4%, to $31.80 an ounce.
