igneous
Pumice or Tuff
Pumice / Tuff
Light-colored, highly vesicular, low density, often contains small dark phenocrysts or lithic fragments.
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Light-colored, highly vesicular, low density, often contains small dark phenocrysts or lithic fragments.
Formation & geological history
Formed from explosive volcanic eruptions where magma is rapidly depressurized and cooled, trapping gas bubbles.
Uses & applications
Used as an abrasive, in lightweight concrete, and for landscaping.
Geological facts
Pumice is often light enough to float on water.
Field identification & locations
Identified by its highly porous texture and light weight. Commonly found in areas with active or geologically recent explosive volcanism.
More like this
Other igneous specimens
Granite
Granite
Igneous
Granite
Granite
Igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Dalmatian Jasper
Aplite with Arfvedsonite inclusions
igneous
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral