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Re: Lava

Would it  be safe use some Lava collected in fields on the eastern  side of 
the Sierra in a tank as a basis for Java moss?  My LFS has lava for sale, but 
I asume it is treated with something.  (Those blokes haven't a clue)  Is 
igneous lava universally safe, or is there a danger of harmful  metals such 
as arsenic? Should I just soak the thing in HCL?