Tag: white stone

Pumice is a light-colored volcanic rock. It’s extremely porous, with a foamy appearance. Crushing pumice rock into a powder produces a substance called pumicite or simply volcanic ash. How Pumice Forms Pumice forms when super-heated, pressurized molten rock violently erupts from a volcano. Gases dissolved in magma (mainly water and carbon dioxide) form bubbles when pressure suddenly decreases, in much the […]