An igneous rock containing abundant vesicles.
a bubbly and glassy lava rock high in iron content
Refers to the angular pebble-sized frothy fragments that have solidified while flying through the air. Lapilli (qv) is a more general term for pebble to granule sized ejecta. Finer material is referred to as ash, and coarser fragments as bombs or blocks. Tuff (qv) is the name for consolidated ash.
Erupted fragments of high gas content magmas. The resulting lava is vesicular; full of gas holes and bubbly looking. Also called volcanic "cinders". A Cinder Cone volcano is formed by the eruption of large amounts of scoria. Back
A cinder-like volcanic rock, usually dark brown, red-brown, or black in color.
Irregular masses of lava resembling clinker of slag; may be cellular (vesicular) dark-colored and heavy.
Dark volcanic rock containing cavities created by gas bubbles trapped in lava. Scoria is formed when blobs of gas-charged lava are thrown into the air during an eruption and cool in flight.
pyroclastic rock composed vesicular cinders, typically of basaltic composition. Its cellular nature is due to the escape of volcanic gases before solidification.
A vesicular cindery crust on the surface of lava flows, the cellular nature of which is due to the escape of volcanic gasses before solidification; it is heavier, darker, and more crystalline than pumice.
Porous, glassy rock formed by the rapid chilling of frothy, relatively silica-poor magma such as basalt or andesite. Scoria is typically dark-coloured; it is denser than pumice and does not float on water.
A bomb-size ( 64 mm) pyroclast that is irregular in form and generally very vesicular. It is usually heavier, darker, and more crystalline than pumice.
Very bubbly (vesicular) basalt or andesite. Both scoria and pumice develop their bubbly textures when escaping gas is trapped as lava solidifies. Scoria is more dense and darker than pumice.
An igneous rock of basaltic composition and containing numerous vesicles caused by trapped gases.
A glassy mafic igneous rock containing abundant air-filled holes.
Dark-coloured droplets or fragments of basalt or andesite, typically formed during fire-fountaining.
Coarse grained rock containing empty cavities.
Scoria are bomb-sized (greater than 64 mm across) pyroclastic fragments that are formed as blobs of lava cool when they are blasted through the air. Scoria are filled with cavities formed by trapped air bubbles.
Scoria is frothy basaltic rock, full of small gas bubbles. Often a black or red colour.
extremely vesicular lava formed as a result of eruption in the presence of gases
porous, cinderlike fragments of basaltic lava, usually darker and denser than pumice. [AHDOS
Scoria is the vesicular ejecta of basaltic and andesitic magmas. Generally a dark brownish black or red, scoria is generally thought of as the mafic version of pumice, forming when magma rich in dissolved gases is vented. Scoria is composed of volcanic glass fragments, and has few mineral crystals.