abyssolith
n. C2 Proficiency abyssolith
n. a type of rock that forms when magma cools very slowly deep inside the Earth. It is usually dark and has a smooth, glassy surface.
n. a rock formed by the slow cooling of magma at great depths within the Earth's crust. Characterised by a fine-grained or glassy texture and typically dark in colour.
The geologist identified the sample as an abyssolith.
The deep-sea volcanic vents produced an abyssolith that remained hidden from the surface for millions of years.
Unlike extrusive igneous rocks that cool rapidly on the surface, abyssoliths exhibit a homogeneous structure due to the immense pressure and slow crystallisation process occurring kilometers below the Earth's crust.