For the past 30 years, Berea Sandstone™ core samples have been widely recognized by the petroleum industry as the best stone for testing the efficiency of chemical surfactants...
Berea Sandstone™ is a sedimentary rock whose grains are predominantly sand-sized and are composed of quartz held together by silica. The relatively high porosity and permeability of Berea Sandstone™ makes it a good reservoir rock...
Split Rock has visible laminations but can be classified as homogeneous. These samples typically yield mD ratings between 100-300.