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expanded clay

Hi there,
            today I bought some expanded clay, but I don't know if it is
It looks light brown outside but it's almost black inside. I don't know if
it's safe for aquarium use so before killing everything in my tank I'm
asking what do you think about this.

It looks like little balls of 1/2-1 inch of diameter and I tried to smash
it to let it sink but it wont so I will wait some days before making it in
more little piecies.

I'd really apprecite your help
Best regards
Simone Vicini (psvicini at mdnet_it)