Dust bath ingredients

I have Kaytee dust bath for my chin and the ingredients info is:

"All natural dusting powder - Inert natural volcanic mineral containing aluminum silicate or more commonly know as pumice, volcanic ash or pumicite."

When I google aluminum silicate I don't find anything that says it's volcanic ash. So I'm guessing the description is volcanic ash mixed with aluminum silicate? That sounds bad.

Could this dust be the reason my chin is itching and barbering? Should I switch him to Blue Cloud dust?