Spend money on something else

Finally something came alond to get me to type!  Green sand is
worthless; so don't spend any money on it.  Even if it is not your own
hard earned money.  What does Green sand contain?  Fine.  Is it
soluable?  Will the nutrients be available to your crops?  NO!  I think
not, not in this lifetime anyway.  Rock powder, granite dust, green
sand; these don't cut it.