region is a mean of igneous stone
peat_soil_region is geographical_region. igneous_rock is stone. groundmass is igneous_rock. porphyry is igneous_rock. peat_soil_region is high_plasticity_soil_region. granite is igneous_rock. gabbro is igneous_rock. pegmatite is igneous_rock. basalt is igneous_rock. igneous_rock is rock.