Pumice is commonly pale in color, ranging from white, cream, blue or grey, to green-brown or black. It forms when volcano-related gases exsolving from very hot liquid rock inside the Earth form bubbles that remain within the very hot liquid rock inside the Earth as it cools to glass.
Rhyolite and trachyte pumices are white, andesite pumices often yellow or brown, and pumiceous basalts. Pumices are most plentiful and most usually developed from felsic rocks; in the same way that way, they commonly go with obsidian.
A natural volcano-related stone, this black pumice comes with a thickly woven cotton strap and can be used on the hands and feet as a natural way to smooth and soften skin.
It is used wet to remove thickened, hard skin patches and hardened dry skin. Pumice is formed by the sudden depressurisation of super-heated very hot liquid rock on the Earth’s surface, usually during the more violent phases often volcano related, quickly cooling as trapped gasses inside expand the very hot liquid rock on the Earth’s surface turns to stone into a light and sponge like form.