Pumice is a light-colored vesicular igneous rock. It forms through very rapid solidification of a melt. The vesicular texture is a result of gas trapped in the melt at the time of solidification.
It commonly forms as a frothy upper surface on silicic lavas.
Texture: aphanitic and vesicular (contains abundant small gas cavities)
Composition: felsic (rhyolitic)
Color: white to light-gray or light-tan
Cooling Rate: rapid, extrusive
Intrusive Equivalent: granite
Other Characteristics: very light and will float on water
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