Found this post, which confirms I'm barking up the right tree
>> Dr. Morin, could you please comment on this? You stated at one point I
>> believe that Flourite was a naturally mined material. Is it subjected to
>> high heat (fired) during processing (to increase internal pore space I would
>> assume) or is it just cleaned, crushed and bagged?
>Well, I can't say too much without getting in trouble ;-)
>All I can say is, the material has experienced high levels of heat.
>It is naturally mined. And the order actually would be crushed,
>cleaned, and bagged ;-)
>Hope that helps, but I can't really say much more without giving away
>a little bit of the "secret".
>- -Greg Morin
>Gregory Morin, Ph.D. ~~~~~~~Research Director~~~~~~~~~~~~~~
>Seachem Laboratories, Inc. http://www.seachem.com 888-SEACHEM