Basanite

This article is about the igneous rock. Basanite is also a variety of Jasper
Not to be confused with Bassanite.
Basanite
Igneous rock
Volcanic bomb of black basanite enclosing a xenolith of green dunite from Réunion

Basanite (/ˈbæs.əˌnaɪt/) is an igneous, volcanic (extrusive) rock with aphanitic to porphyritic texture. It is composed mostly of feldspathoids, pyroxenes, olivine, and calcic plagioclase and forms from magma low in silica and enriched in alkali metal oxides that solidifies rapidly close to the Earth's surface.