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SharePumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite.
Pumice is usually light in colour ranging from white, yellowish, gray, gray brown, and a dull red.
Pumice has an average porosity of 90%.
Pumice is formed as pyroclastic material is ejected into the air as a froth containing masses of gas bubbles or vessicles, the lava solidifies quickly and the vessicles are contained in the rock.
For more information about the topic Pumice, read the full article at Wikipedia.org, or see the following related articles:
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