The decline came in spite of both European and US markets edging slightly higher. Unlike those markets, the UK's index is heavily influenced by mining shares, and the commodity sector performed very poorly on Friday.
Copper and iron ore prices fell on concerns about oversupply, and Brent crude fell by almost three percent, back down to $57.52 a barrel, after concerns about the impact of Saudi Arabia's military action in Yemen on oil supplies eased.
Anglo American lost 32.5p, down to £10.44, while Rio Tinto shed 67.5p, down to 2809.5p, and BHP Billiton lost 35p, down to 1507.5p.
There was also some concern about the health of the US economy. The GDP growth figures for the fourth quarter remained at 2.2 percent, disappointing analysts who had been predicting an increase in those figures. Investors are now waiting for news on the possibility of an interest rate increase.
One of the strongest performers of the day was the cruise company Carnival. The company saw its share price increase by 217p, up to £32.41p, thanks to some better expected results caused by the recent fall in oil prices. The greetings card retailer, Card Factory, saw its shares rebound thanks to a nine percent increase in full year profits.