I was wondering if anyone has tried using the Red Jurassic Sand with Uromastyx??
http://www.jurassicsand.com/index.html I have been using this exclusively for my Teratoscincus scincus keyserlingii (geckos) for 6 years. It also mixes well with organic soil free of any vermiculite/perlite and fertilizers, which I bake in the oven for 30 minutes at 300 degrees to kill off any mites, etc... I use this mix for other gecko species I have that like to burrow but also need a slightly higher humid environment. It is entirely dust-free. For my Teratoscincus geckos, close to zero humidity, I wet it down and allow it to thoroughly dry with a heat lamp (usually 2-3 days). It hardens just enough so that they can create burrows (without collapsing). It does not cause gut impaction or any discoloration because it is a natural red sand that comes from Utah. The best thing, is that it also clumps nicely so poop can easily be taken out. I remove the sand entirely and wash it about every two years.
It is not cheap, but imo so worth the extra cost to simulate a more natural environment.
It has been a couple years since I ordered it from Jerry, but I believe it cost me $175 for 150 pounds, shipped from Utah to Texas.
~ Sarah.