I've been witness to, and creator of,
some pretty wild mixtures back in the years when I did such things.
have you ever seen nonferrous matter incorporated into molten iron so homogeniously as the silicates in this material - when the incorporated stuff has only about 40% the density of the iron it's self? not saying it cant happen - i'd just be really surprised if it was easy. As adam said you can suspend a piece of lead shot in a block of ice - but try and evenly distribute a very low density material in something of high density while you freeze it - at almost 3000 degrees and i'm sure it wont be as easy.
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