Unknown mineral

[JMN16150]

Does anybody know what this mineral might be? http://s1251.photobucket.com/albums/hh545/JMN16150/?action=view&current=SAM_0976_zps13d1bcfc.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!!!!!!!!!!

 

[scottychaos]

General rule of thumb, applies to everything in life, not just CP's!

"If you don't know what it is, don't use it!"

Scot

 

[cp777]

Looks like crushed coral to me. here is the pic again.

Here is some crushed coral.

I don't know if it is OK for pings though.

 

[Not a Number]

Put some in vinegar. If it fizzes and/or dissolves it might be coral or limestone. Either of which when well rinsed should be ok for Mexican Pinguicula. I'd mix some sand into it.