Pumice is a term for a lightweight volcanic rock. It is a solidified frothy lava, created when highly-heated, pressured molten rock is shot out from a volcano. Its light weight is due to air spaces, which are caused by fast cooling and loss of pressure.

Pumice in its powdered or dust form is known as pumicite. It is a very porous, froth like volcanic glass. It consists of highly vesicular rough texture, which may or may not contain crystals. Typically it has a light-color. Other than pumice there is another vesicular volcanic rock, Scoria.

PUMICE definition: 1. a type of grey, light stone that is used in pieces or as a powder for rubbing things to make…. Learn more.

Jan 2, 2025 · pumice (countable and uncountable, plural pumices) A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas …

Pumice is a very light stone that comes from volcanic rock. Formed from lava, pumice is porous, or full of tiny holes. It may sound exotic, but you can buy one at the drug store and scrub your feet with it.

Oct 9, 2021 · It is basically whipped volcanic glass that is made up of tiny air bubbles. This means that pumice is a lightweight volcanic rock that makes it perfect for use as a soil amendment. The airy rock is ideal for use with cacti and succulents as well as other plants that require excellent drainage and air circulation.

Then I reached up for the pumice, which I keep on a shelf, above and to the left of the window. They were made of volcanic pumice stone, ribbed with whalebone ivory and studded with gold. noun: pierre ponce [...] noun: piedra pómez [...]

What does pumice‎ mean? From Anglo-Norman and Old French pomis ("pumice stone"), from Latin pūmex ("pumice stone"). A light, porous type of pyroclastic igneous rock, formed during …

Also called pum ice stone . a porous or spongy form of volcanic glass, used as an abrasive. pumiced, pumicing. to rub, smooth, clean, etc., with pumice.

Pumice is a textural term for a type of volcanic rock which is a solidified frothy lava that is composed of highly microvesicular glass pyroclastic with very thin, this is translucent bubble walls of extrusive igneous rock.