What do you think of Alun Stone as a deoderant and for other uses?

Hi, I'm from North Africa and using it is pretty common here. Some use the stone as it is, or in powder form or mixed with other ingredients.

I've been using it in pure powder form for many years. After I shower, I grab a bit of it and just rub it on my under arms. I don't smell for days.

Now I'm not sure if this is healthy or not and would like to get your opinion.

I also have some left over that has some debris in it and I was wondering what else I could use it for... Maybe in a foot bath?

Thank you!