>> Not magnesium, no. (Not at any appreciable rate, at least.) Try it 
>> with, say, sodium and you've have a Big Problem. Magnesium is far too 
>> unreactive for it to be a problem.
> 
> But when the metal is at the combustion point it would react with the 
> water, right?
> 
> Yes, right ... http://en.wikipedia.org/wiki/Magnesium#Precautions

Oh, well, I've only tried mixing it in water at room temperatures.

> Sodium reacts if you so much as look at it wrong...

Yes. ;-)

And calcium bubbles quite a bit.

And magnesium... well after about an hour a few tiny bubbles had formed 
on its surface. So I guess that's a sort-of reaction?

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