Scoria - WikipediaScoria is a highly vesicular, dark colored volcanic rock that may or may not contain crystals . It is somewhat porous, has high surface area and strength for its weight, and often has striking colours. Scoria is often used in landscaping and.scoria surface area,Scoria: Igneous Rock - Pictures, Definition & More - GeologyScoria is a dark colored, extrusive igneous rock with a vesicular texture. . These areas are called "volcano fields." (See the . The gas bubbles in the flow move upwards towards the surface in an attempt to escape while the lava is still molten.