I found this startling fact on World's Best Cat Litter web page
"SILICA CAT LITTER
Silica gel litter is made from silica dioxide sand (the same material found in quartz), oxygen and water. The gel contains millions of tiny pores that can absorb up to 40 times their weight in moisture. It comes in spheres (also called “pearls”), half spheres and crystal shapes. Some manufacturers add dyes and scents, so you want to watch out for, and avoid, those. The most worrying part of silica is that it is a well known carcinogen (a substance that promotes cancer).
Crystals are silica which is a known carcinogen.
Not compostable or bio-degradable. "
Scary, huh???
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