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What you are actually looking for is fired ('calcined') montmorillonite, aka arcillite, rather than the raw clay. So you might want to expand your search terms to include arcillite as well as montmorillonite.

In addition to being used as a large-scale soil amendment, it has a variety of specialty horticultural applications, including things such as bonsai, orchids and cacti. So those would be some other possibile sources to check out.

Turface vs STS: If you look at individual grains, STS has slightly more variability in both grain size and color. This might be the reason that some folks think STS has a more naturalistic look. If you step back and look at overall color, STS is slightly grayer than natural buff-colored (it's also available in a ghastly shade of red) Turface. This might make STS marginally more suitable for a tank with a black background. But the differences are small.

In general, montmorillonites work well. However, they aren't the perfect answer. They aren't heavy enough to hold unrooted stems, and they will mess with your water chemistry for a while. Workarounds for both are described in various other threads.
 

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Internet forums aren't the perfect communications medium. They give the appearance of being interactive, which discourages the hard work of editing a post before committing it. However, in general, they work well, and it's usually possible to revise a poorly phrased post after the fact. So:

"Montmorillonites aren't the perfect answer. They aren't heavy enough to hold unrooted stems, and they will mess with your water chemistry for a while. However, in general, they work well, and workarounds for both problems are described in various other threads."

Also applies to spelling errors, eg "possibile" for "possible".
 

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"So does anyone know anything about attapulgite clay?"

Was not aware that it was used for kitty litter. But you could give it a try. You might find yourself in a position to contribute some useful information to the hobby. Of course, Diana's caveats re kitty litter would apply.

"Any other current (not discontinued) clays I can look at?"

Shale and slate are both geologically processed clay. So you could also look for fired shale or slate. In the US, this would be Haydite and Stalite Permatill, among others. You might have better luck finding locally manufactured equivalents.
 
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