Kevin Wampler wrote:

> > 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

That's what I was thinking, but I wasn't too sure. My mineral book is two flights
of stairs away too ;)

--
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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