The Australian share market has finished lower after the price of oil plunged, sending energy stocks into a tailspin.

The benchmark S&P/ASX200 index finished down 35.8 points, or 0.55 per cent, to 6,456 points at 1515 AEST on Friday, while the broader All Ordinaries was down 38.7 points, or 0.59 per cent, to 6,545.6.

The Aussie dollar is buying 68.95 US cents, from 68.71 US cents on Thursday.