Imerys SA, a French building- materials company, agreed to buy AmcolInternational Corp. of the U.S. for $1.6 billion including debt to add specialty minerals used in industrial and consumer applications.

Imerys will begin a tender offer for Amcol at $41 a share in cash within the next 10 business days, the companies said in a statement today. The price is 12 percent above yesterday’s closing level on the New York Stock Exchange and 19 percent more than the average price over the last 30 trading days.

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