Pumice is a highly vesicular, low-density volcanic rock composed predominantly of silica-rich glass and fine-grained crystals, formed by rapid depressurization and quenching of gas-charged felsic to intermediate magmas during explosive eruptions. As a substance, it is characterized by an interconnected network of gas bubbles, yielding very low bulk density and high porosity, often sufficient to allow flotation on water. Mineralogically, pumice typically contains quartz, feldspar, and minor mafic phases embedded in a glassy matrix. Its high surface area and chemical stability under ambient conditions make it relevant in filtration media, lightweight construction materials, and as a substrate in various geochemical and petrological studies.
Science never stops. Get notified about trending stories.
