Few months ago I read in a french bonsai site about Lutite a sort of
earth
is made with sandstone and clay is compressed and shreds easily
They found it in the Region of Montpellier and are trying to use it
with good results as
ersatz of Akadama as too expensive , Lutite exists all over the
world
Canada Greenland colombia austarlia japan and so on
anyway and I found geological studies made on its composition in the
USA

This Lutite soil is normally magenta red ,and has a tendency to
keep moist and is better
if added with sand to enhance drainage
I found this site with differents pics of the soil but is in japanese
:-)
www.herbenjoy.com/ garden/point1.htm

it could be the next gold rush as is a mineral that is found also as
matrix for emeralds in
Colombia and others minor precious stones like garnets
I posted here just in case some has some at hand and can give a try to
experiment it or supply more info
from the Japanese written page
Thanks
Theo

* Think like an Alien &discovery your own planet*