On Tue, 23 Jul 2013 05:48:15 -0700 (PDT), Helpful person
> wrote:

> Hardness doesn't matter as long as it is harder than
> the seed you are pulverizing.

I used to have a small wooden one that disappeared a few years ago. I
look at mortar and pestles occasionally (no real need to replace it, I
use a coffee grinder to pulverize these days) and what I notice is
some are rough on the inside and some are smooth. It seems to me that
would be a bigger difference than anything else. I like the idea of a
rough interior, but seems like it would be hard to clean.

--
Food is an important part of a balanced diet.