Pumice

Pumice stone -- Rough feet in the bed in winter is a real turn off and they don't look very nice in summer sandals.

Dr. Susan Taylor: 12 Beauty Essentials For 2012 Dr. Susan Taylor 2012

Pumice fragments may form temporary mats of floating material if deposited on water.

volcanic ash hazards and ways to minimize them 2009

… Would have appreciated the barest bit of explanation for the floating mountain islands in Avatar… Pumice stone full of helium?

The Buzz: Filmmakers React to Avatar | /Film 2009

But then after only a three-hour wait and some day-old, free coffee, a young bush pilot ambled over and asked if we were the guys going to Pumice Creek.

Fool’s Paradise John Gierach 2008

But then after only a three-hour wait and some day-old, free coffee, a young bush pilot ambled over and asked if we were the guys going to Pumice Creek.

Fool’s Paradise John Gierach 2008

Pumice and ash deposits are found all over the southern part of the island and various eruptions and seismic events have defined most of the landforms of the central North Island.

Northland temperate forests 2008

Pumice and pumicite are used to make lightweight construction materials such as concrete block and concrete.

Pumice 2008

But then after only a three-hour wait and some day-old, free coffee, a young bush pilot ambled over and asked if we were the guys going to Pumice Creek.

Fool’s Paradise John Gierach 2008

Pumice is a type of extrusive volcanic rock, produced when lava with a very high content of water and gases (together these are called volatiles) is extruded (or thrown out of) a volcano.

Pumice 2008

Pumice is the only rock that floats on water, although it will eventually become waterlogged and sink.

Pumice 2008