Basalt

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- Basalt a fine grained mafic igneous rock consisting augite + calcic plagioclase.(augite is a high-Ca pyroxene and Calcic plagioclase refers to plagioclase crystals contain more anorthite than albite.

-Basalt exist in tectonic environment such as (MOR, island arcs, back-arc basins, intraplate oceanic islands, Lip, and intra-continental rifts).

-basalt may be aphyric, but contain more commonly phenocrysts or microphenocrysts of olivine and of pyroxene and plagioclase in evolved basalt.