New Delhi, April 30 -- Indian stock market remained under pressure on Thursday amid rising geopolitical tensions and a spike in Brent crude prices to wartime high.

At close, the Sensex was down 582.86 points or 0.75 percent at 76,913.50, and the Nifty was down 180.1 points or 0.74 percent at 23,997.55. Nifty midcap index shed 1 percent and smallcap index fell 0.5 percent.

The overall market capitalisation of BSE-listed firms dropped to Rs 464 lakh crore from nearly Rs 469 lakh crore in the previous session.

Among the sectors, most of the indices traded in the red, barring the Nifty IT index. Nifty Auto, metal and PSU Bank indices were down up to 2 percent, while banking, realty, and metal stocks also saw sharp declines.

India's rupee we...