|This is a pumice. There is lot of it in Teide National Park. Pumice is a volcanic rock with high porotisty. The best known use as a pumice stones.|
In the background is the Pico de Teide, which is an active voulcano, the highest spanish elevation - 3718 m. Last eruption was in 1909. pico de Teide is placed in the central of National Park which is World Heritage Site by UNESCO since 2007.
Whole National Park is full of volcano peaks and the landscape is just magnificient like from other world.