RPT-US STOCKS-Market sags on confidence data, but quarter shines

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* Consumer confidence unexpectedly drops in June

* S&P 500 .SPX registers best quarter since 1998

* Dow off 1 pct, S&P 500 off 0.9 pct, Nasdaq off 0.5 pct

* For up-to-the-minute market news click [STXNEWS/US] (Updates to close)

By Ellis Mnyandu

NEW YORK, June 30 (Reuters) - U.S. stocks fell on Tuesday as an unexpected drop in consumer confidence cooled recent optimism about an economic recovery, but Wall Street still closed out its best quarter in a decade.

The drop in the Conference Board's measure of consumer confidence in June suggested that the 18-month-long recession had yet to loosen its grip on the U.S. economy. (For details, see [ID:nN30517712])

Gloom among consumers is a major obstacle as their spending is a major driver of corporate profits and accounts for roughly two-thirds of U.S. economic activity.

Tuesday's standout decliners included industrials, energy and material stocks, some of the very same sectors that helped underpin the market's push to recover from the 12-year lows of early March as investors bet on economic stabilization.

"Consumer confidence is the excuse du jour for the latest market move," said Tom Alexander, head of Alexander Trading, in Savannah, Georgia.

"For the market to go much higher, you are going to have to see some real hard evidence of some of these things that are being anticipated by the market, start to come to fruition. Pick one. Are the bank balance sheets really cleaned up? Nobody knows. The market has gone up on a lot of faith here."

The Dow Jones industrial average .DJI slipped 82.38 points, or 0.97 percent, to 8,447.00. The Standard & Poor's 500 Index .SPX dropped 7.91 points, or 0.85 percent, to 919.32. The Nasdaq Composite Index .IXIC shed 9.02 points, or 0.49 percent, to 1,835.04.

Even so, the S&P 500 posted its best quarterly performance since the fourth quarter of 1998. For the month of June, the Dow shed 0.6 percent, while the S&P 500 inched up 0.02 percent, and the Nasdaq climbed 3.4 percent.

Since its 12-year closing low on March 9, the S&P 500 is up 35.9 percent.

Among industrial stocks, shares of Caterpillar Inc (CAT.N), a maker of bulldozers and excavators, slumped 4.9 percent to $33.04, while on the technology front, International Business Machines Corp (IBM.N) tumbled 1.3 percent to $104.42.