Vermiculite vs Perlite

Depends on the job your trying to accomplish. Vermiculite holds moisture much more so the they not exactly comparable in that way.
 
This might help you decide.

FAQ: Perlite/Vermiculite/Coco Coir/Peat Moss

Perlite, Vermiculite, Coconut Coir, and Sphagnum Peat Moss are four grow additives which require a very clear understanding of what they are, do, and how to avoid disaster born from confusion. What are they? Perlite is volcanic rock that expands greatly when heated. Perlite that's sold as a...
www.rollitup.org

It's suppose to hold too much water for coco if that's what you're thinking of using it with.
 
Check your local feed store for crushed oyster shell (also called oyster grit, used for chickens). Its cheap and should do roughly the same job as perlite by providing air pockets

Added bonus, over a long time it will release trace amounts of calcium. And I mean a long time... so if your not reusing your soil, you wont get any of those effects because the oyster grit is too coarse (roughly the size of perlite) to break down in soil that quickly... Would take years
 
yes yiou can use it instead, but jut remember vermic holds water, so you wont need to water so offten
 

I've always wondered about the silica thing though.
Excessive water retention is something that can be dealt with fairly easily.
 
oh yes, with vamic, it will store nutes in the water too, so when your growing, yoy wont have to feed quite so much,
vamic also gives the grow nutes if its in the soil long enough
 
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