"sf" > wrote in message
...

> Darker granite is supposedly harder (less porous) than lighter colored
> granite and it certainly isn't like cast iron because the slab is
> composed of more than one type of rock. If you're banging where a
> quartz crystal is you might chip it out - but those chips can be
> repaired/filled with a little resin.

I was looking up countertops the other day and was surprised to see that the
quartz stuff is not slabs of quartz at all but quartz mixed with a composite
of stuff.