Igneous
Pumice or Scoria
Vesicular volcanic rock
Highly vesicular (porous) texture, light color (if pumice) or darker (if scoria), relatively low density, rough texture.
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Physical properties
Highly vesicular (porous) texture, light color (if pumice) or darker (if scoria), relatively low density, rough texture.
Formation & geological history
Formed from gas-rich, frothy magma that cools rapidly during an explosive volcanic eruption, trapping gas bubbles (vesicles).
Uses & applications
Used as an abrasive, in lightweight aggregate for concrete, and as landscaping material.
Geological facts
Pumice can be so light that it floats on water due to its high porosity.
Field identification & locations
Identifiable by its sponge-like appearance and light weight. Commonly found near active or extinct volcanic regions.
