American Laterite?/Natural Gold?

I know of three brands of laterite-  Dupla, Thiel, and Substrate Gold.  Dupla
is mined from overseas, and the other two I believe are mined in the United
States.  Where in the United States does laterite exist?  I hope they are not
getting the red clay from the southern United States and calling it laterite,
because I do not think this is true laterite.  I have only used the Dupla
brand.  Has anyone used the Thiel, or Substrate Gold?  What did you think of
it?  Does anyone have the liquid fertilizer-  "Natural Gold"- that can list
the ingredients here?   Jeff