• The kind of rock with the lowest density, making it the lightest, is pumice. It has a density of less than one. Most rocks have a density of between 2 – 4. The density of a particular piece of pumice varies but generally is less than one.

  • Pumice is an extrusive volcanic rock. It is usually pale in color and very lightweight. When a volcano erupts, gases escape causing fast cooling and depressurization of the surrounding molten lava, filling it with air pockets. This results in a rock so lightweight it often floats!

    why is pumice so light? Pumice is a very light colored, frothy volcanic rock. Pumice is formed from lava that is full of gas. The lava is ejected and shot through the air during an eruption . As the lava hurtles through the air it cools and the gases escape leaving the rock full of holes. Pumice is so light that it actually floats on water.

    Furthermore, what type of rock is pumice?

    igneous rock

    Is pumice hard or soft rock?

    Mohs Hardness Scale

    Material Mohs Hardness Talc 1 On the Mohs Hardness Scale, Talc is the softest, Diamond the hardest. Feldspar 6 Pumice (Hess Deposit) 6 Quartz 7

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