A subvolcanic rock, also known as a hypabyssal rock, is an igneous rock that originates at medium to shallow depths within the crust, and has intermediate grain size and often porphyritic texture. They have textures between volcanic and plutonic rocks. Subvolcanic rocks include diabase (also known as dolerite) and porphyry.
See also 
|This volcanology article is a stub. You can help Wikipedia by expanding it.|