Does anybody know what this mineral might be? http://s1251.photobucket.com/albums/...ps13d1bcfc.jpg
I was looking around in my garage, where my dad keeps different kinds of cichlid or aquarium substrates, and I found this substrate. I asked my dad if I could use it for plants and he said yes... Would anyone know if it were okay for pinguiculas, also I flushed it with R.O. water just in case. THANKS!!!!!!!!!!