Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite.
Pumice is usually light in colour ranging from white, yellowish, gray, gray brown, and a dull red.
Pumice has an average porosity of 90%.
Pumice is formed as pyroclastic material is ejected into the air as a froth containing masses of gas bubbles or vessicles, the lava solidifies quickly and the vessicles are contained in the rock.
For more information about the topic Pumice, read the full article at Wikipedia.org, or see the following related articles:
Volcanic rock Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain ... >
read more
Volcanic cone Volcanic cones are among the simplest volcano formations. They are built by fragments (called ejecta) thrown up (ejected) from a volcanic vent, ... >
read more
Concrete In construction, concrete is a composite building material made from the combination of aggregate and cement ... >
read more
Igneous rock Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive ... >
read more
Krakatoa Krakatoa is a volcanic island in the Sunda Strait between Java and Sumatra in Indonesia. It has erupted repeatedly, massively and with disastrous ... >
read more
Basalt rock Basalt is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic ... >
read more
Mount St. Helens Mount St. Helens is an active stratovolcano in Skamania County, Washington, in the Pacific Northwest region of the United States. It is located 96 ... >
read more
Desert In geography, a desert is a landscape form or region that receives very little precipitation. Generally deserts are defined as areas that receive an ... >
read more
Stratovolcano A stratovolcano is a tall, conical volcano composed of one layer of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a ... >
read more
Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Pumice at Wikipedia.org. See the Wikipedia copyright page for more details.
Recommend this page on Facebook, Twitter,
and Google +1:
Other bookmarking and sharing tools: