igneous
Pumice or Vesicular Basalt
Vesicular volcanic rock
Mohs hardness around 5 to 6, light gray to dark gray color, dull luster, aphanitic texture with prominent gas cavities (vesicles), specific gravity varies greatly depending on trapped air.
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Physical properties
Mohs hardness around 5 to 6, light gray to dark gray color, dull luster, aphanitic texture with prominent gas cavities (vesicles), specific gravity varies greatly depending on trapped air.
Formation & geological history
Formed from rapidly cooling gas-rich volcanic lava where escaping gas bubbles leave behind empty cavities or holes in the solidifying rock matrix.
Uses & applications
Used in lightweight aggregate, landscaping, abrasive personal care products, and horticulture.
Geological facts
Vesicular rocks are common in volcanic regions worldwide. Some types of pumice are light enough to float on water due to their high porosity.
Field identification & locations
Easily identified by its distinct sponge-like appearance and numerous small holes. Found near volcanic fields, calderas, and ancient lava flows.
