1, Basalt (Basalt) is a kind of basaltic eruption rock, by the volcanic eruption of magma in the surface cooling after solidification of a kind of dense or foam structure of the rock, belongs to the magma rock. Its rock structure is often porous, amygdaloidal structure and porphyritic structure, sometimes with large mineral crystals, unweathered basalt is mainly black and gray, but also black-brown, dark purple and gray-green.

2, basalt bulk density of 2.8 ~ 3.3g/cm3, the structure of the dense compression strength is very large, can reach 300MPa, or even higher, but if with crystal impurities and pores will reduce the strength.

3, basalt durability is very high, more joints, and joints face more hexagonal (in the basalt lava flow, the vertical condensation surface of the rock is often developed into a regular hexagonal columnar joints). And with brittleness, so it is not easy to quarry large stone, due to the common pores and almond structure, although the basalt surface is widely distributed, but can be used as a finishing stone is not much.