Brick masonry plays an important role in the field of construction, signifying the need to study the nature of behaviour of masonry in different conditions and compositions. In this project, manufacturing and studies on the experimental investigation of material properties, compressive and shear behaviour of brick masonry with different materials are used like magnesite and clay. The magnesite is found in nature usually as secondary deposit formed due to 1) Alteration ultramafic rocks (mostly serpentine) as is found in chalk hills, Salem, and Dodkanya in Karnataka. Pure clay mineral is formed from the erosion and weathering of primary igneous rocks. In the process it picks up a number of impurities, quartz, mica, calcium carbonate (lime), iron oxide etc... The strength of partially replaced magnesite brick are gradually increased by 10% when compared to conventional bricks. In this magnesite bricks are partially replaced in clay. From the results it was observed magnesite bricks are good.