Vesicular texture is a volcanic rock texture characterised by, or containing, many vesicles. The texture is often found in extrusive aphanitic, or glassy, igneous rock. The vesicles are small cavities formed by the expansion of bubbles of gas or steam during the solidification of the rock. This article is about volcanoes in geology. ... Sedimentary, volcanic, plutonic, metamorphic rock types of North America. ... An aphanite is an igneous rock with a fine-grained structure. ... Volcanic rock on North America Plutonic rock on North America Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ...

A related texture is amygdaloidal in which the volcanic rock, usually basalt or andesite, has cavities, or vesicles, that are filled with secondary minerals, such as zeolites, calcite, quartz, or chalcedony. Individual cavity fillings are termed amygdules, (American usage), or amygdales (British usage). Sometimes these can be sources of semi-precious stones such as agate. Amygdaloid, derived from the Latin for almond, can refer to: the amygdala in the brain. ... Basalt Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. ... Andesite is an igneous, volcanic (extrusive) rock, of intermediate composition, with aphanitic to porphyritic texture. ... Zeolite Zeolites (Greek, zein,to boil;lithos,a stone) are minerals that have a porous structure. ... Calcite from Brushy Creek Mine, Missouri, USA. The mineral calcite is a calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the Earths surface. ... Quartz is the most abundant mineral in the Earths continental crust. ... Chalcedony Knife, AD 1000-1200 Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. ... Agate is a term applied not to a distinct mineral species, but to an aggregate of various forms of silica, chiefly Chalcedony. ...

Rock types that display a vesicular texture include pumice and scoria. Specimen of highly porous pumice from Teide volcano on Tenerife, Canary Islands. ... Categories: Stub | Igneous rocks | Volcanology ...