Compressive Strength Of Basalt Rock. Basalt rock compressive strength mc machinery basalt rock properties and uses science struck the rock hardness of basalt is 6 on the mohs scale and can be seen through a combination of its compressive strength 100300 mpa megapascal its tensile strength 1030 mpa and its shear strength 2060 mpa which denotes that depending on the mineral makeup basalt rocks ...