>
> The nature of the break is guess-work - I have never seen a marble break in
> two, but I am assuming it would break something like sheet glass - on the
> whole smoothly, but with rough jaggy patches.

IIRC, glass typically breaks in what is called a conchoidal fracture.  A
conchoidal fracture consists a a bunch of concentric rings and liiks a bit like
a shell.  There is a (rathar poor quality) picture of such a fracture at
http://www.cobweb.net/~bug2/rock4.htm#FC

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