The Australian share market has moved lower as the heavyweight mining and financial sectors slipped into negative territory.

The benchmark S&P/ASX200 index was down 19.8 points, or 0.30 per cent, to 6,631.0 points at 1200 AEST on Monday, while the broader All Ordinaries was down 20.9 points, or 0.31 per cent, to 6,713.4.

Consumer staples shares collectively fell 1.22 per cent, leading losses at midday.

IGA supplier Metcash fell 9.37 per cent to $2.855 after it announced a decline in food earnings and higher finance costs.

Coles was down 2.72 per cent to $13.055 while supermarket rival Woolworths was down one per cent to $32.66, and Wesfarmers was down 0.85 per cent to $36.10.

Mining giant BHP edged up 0.07 per cent to $41.06 but Rio Tinto was down 0.25 per cent to $101.29 and Fortescue Metals fell 0.11 to $8.86.

The big four banks were all lower, with ANZ down 0.16 per cent to $28.495, Commonwealth down 0.10 per cent to $82.16, NAB down 0.22 per cent to $26.79, and Westpac down 0.62 per cent to $28.055.

Telecommunications shares were the highest climbers, advancing 0.35 per cent as a whole, and the only gainers apart from the energy and property trust sectors.

Telstra was up 0.93 per cent to $3.815, TPG was down 2.40 per cent to $6.52 and GTN was up 1.91 per cent to $1.065.

Aveo was down 11.78 per cent to $1.835 after the retirement home operator said it expected a fall in its full-year profit.

The Aussie dollar is buying 69.51 US cents from 69.22 US cents on Friday.