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Was (wer) ist pumice powder - definition
![Rocks from the [[Bishop tuff]], uncompressed with pumice on left; compressed with [[fiamme]] on right.](https://commons.wikimedia.org/wiki/Special:FilePath/ BishopTuff.jpg?width=200 "Rocks from the [[Bishop tuff]], uncompressed with pumice on left; compressed with [[fiamme]] on right.")
![U.S. 20-dollar bill]] demonstrates its very low density.](https://commons.wikimedia.org/wiki/Special:FilePath/Pumice on 20 dollars.jpg?width=200 "U.S. 20-dollar bill]] demonstrates its very low density.")
![Two layers of pumice, first major phase of the Late-Bronze-Age volcano eruption (~ 1500 BC), southern part of the [[Caldera]] island Thera/[[Santorini]].The lower layer is finer, almost white and without intrusions..](https://commons.wikimedia.org/wiki/Special:FilePath/Akrotiri Santorini-Volcano pumice-layers Aegean-Sea.jpg?width=200 "Two layers of pumice, first major phase of the Late-Bronze-Age volcano eruption (~ 1500 BC), southern part of the [[Caldera]] island Thera/[[Santorini]].The lower layer is finer, almost white and without intrusions..")
Wikipedia
Pumice ( ), called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls, and being dark colored and denser.
Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. The depressurization creates bubbles by lowering the solubility of gases (including water and CO2) that are dissolved in the lava, causing the gases to rapidly exsolve (like the bubbles of CO2 that appear when a carbonated drink is opened). The simultaneous cooling and depressurization freeze the bubbles in a matrix. Eruptions under water are rapidly cooled and the large volume of pumice created can be a shipping hazard for cargo ships.
