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Must've had a lot of copper in that asteroid.
Probably nickel and/or salts of barium. Copper burns blue as a pyrotechnic colorant.
Ah ok. I was going to say nickel but I did a quick search and somehow I read that it was copper.
Depending on the salt you can make both blue and green. Copper sulphate flame test is a pretty common school lab practical isn't it?
A lot of spaceship debris looks like this because copper is used in a lot of rocket engines.
Alternatively or additionally, I think oxygen plasma glows blue or green, because northern lights (near the poles, at least) are greenish.