Which stone can not sink in water?

Answer 1

Pumice does not sink in water.

This is because pumice, type of lava, forms by the rapid cooling of lava that contains significant amounts of dissolved gasses. When the lava erupts the sudden decrease in confining pressure on the lava allows this gas to come out of solution. This makes lots of bubbles form very rapidly (the lava is essentially a foam).

As the lava cools very rapidly the bubbles are trapped in the solidifying material forming the hollow void spaces known as vesicles which result in pumices low density.

Answer 2

Pumice, however it should be noted that the mineral is buoyant due to bubbles of air trapped within it, not because of the density of the mineral itself.

Answer 3

Pumice stone does not sink in water unless it has been floating for many years.

Pumice

Answer 4

Pumice stone is a type of volcanic rock that contains numerous air pockets, which makes it less dense than water and causes it to float rather than sink.

Answer 5

hajr e aswad

pumice

Answer 6

A dry stone.

Answer 7

Pumice, a kind of volcanic stone.