12 Commonly Used Building Stones - Their Properties and ...
2. Basalt and trap. Basalt and trap are also igneous rocks. These stones are also called as green stones or white stones or blue basalt. They are hard and tough. It is difficult to work with this kind of rocks. The specific gravity of basalt and trap varies from 2.6 to 3.0. They are having a high compressive strength of 150 to 190 MPa. Uses
