Michael Press wrote:W
> On the Moh scale of harness marble is 3, agate is 7.
> No contest. Basically everything harder than agate is
> diamond or some form of aluminum oxide. In addition,
> marble is porous making it impossible to clean out old
> oil that seeps in. You will never get that stale black
> pepper oil out of your marble mortar. And marble is
> subject to chemical attack. Better one those white
> porcelain sets.
>
[snip]

Where did you get your agate mortar and pestle? It might come in
handy for me, because I envision wanting to finely grind spices
and herbs.

Thanks,

Jean B.