The Australian share market has opened lower and looked to be heading further downwards, with the major miners among the largest losers.

The benchmark S&P/ASX200 index was down 19.1 points, or 0.30 per cent, to 6,340.4 points at 1030 AEST on Tuesday, while the broader All Ordinaries was down 18.2 points, or 0.28 per cent, to 6,431.4.

Utilities shares led losses, collectively down 0.85 per cent, followed by a heavyweight materials sector that shed 0.83 per cent.

Mining giant BHP was down 0.93 per cent to $37.47, Rio Tinto was down 1.29 per cent to $96.49 and Fortescue Metals was down 1.93 per cent to $7.11.

Losses in telecommunications moderated after a sharp initial drop at the start of trade, but the sector was still down 0.66 per cent.

Telstra was down 0.15 per cent to $3.355, TPG fell 0.22 per cent to $6.795 and Vocus dropped 3.40 per cent to $3.835 after being hit by a shareholder class action.

Three of the big four banks were also in negative territory, with ANZ down 0.18 per cent to $27.28, Commonwealth down 0.24 per cent to $74.93 and NAB down 0.16 per cent to $25.40.

Westpac was the outlier, gaining 0.25 per cent to $27.65.

Bubs Australia was up 9.52 per cent to $1.264 after it reported its third-quarter revenue more than doubled.

Nine Entertainment was up 1.87 per cent to 1.7725 after it agreed to sell its regional and community newspapers for $115 million.

The Reserve Bank of Australia is due to release data on private sector credit at 1130 AEST on Tuesday.

The Aussie dollar is buying 70.55 US cents, unchanged from Monday.