Glencore shares are volatile and falling as European markets open

European markets are looking choppy and mixed at the open on Tuesday.

Glencore shares rose by 4% at the open, then quickly slumped, after rising by an astonishing 21.05% on Monday - there's been enormous volatility in the stock since its 29% collapse a week ago.

The firm's future has been the subject of intense speculation, as it's particularly exposed to the impact of tumbling commodity prices.

Here's how it looks as of 8:04 a.m. UK time (3:04 a.m. ET):

Investing.com

The only major bit of economic data that we've had out on Tuesday morning was the miss in German factory orders, which slumped 1.8% in August from July, against analyst expectations for a 0.5% boost.

The FTSE 100 as a whole is down 0.11%

European markets mostly opened down a little, after a massive day to start the week on Monday.

• Germany's DAX: -0.35%
• France's CAC 40: -0.16%
• Italy's FTSE MIB: +0.06%
• Spain's Ibex: +0.22%

Asian markets are in a mixed state - Hong Kong's Hang Seng is down down 0.21%, China's Shanghai Composite is up 0.48%, and Japan's Nikkei is up 1%.