G684 Basalt granite
Basalt (Basalt) is a extrusive rock solidified from the volcanic eruption of magma in the earth's surface after cooling a dense like rocks or foam-like structure, are magmatic rocks. Rock structure often with vesicular, almond-shaped structure, and porphyritic structure, sometimes with large mineral crystals, unweathered are mainly black and gray, dark brown, dark purple and gray-green colors.

Basalt bulk density of 2.8 ~ 3.3g/cm3, compact structure and compressive strength up to 300MPa, or even higher, but with crystal impurities and stomatal strength decreased.normally we called basalt to be the same kind as granite .

 excellent performance of compressive and good wear resistance, low water absorption, which is also very good decorative building materials, can be widely used for indoor and outdoor decoration, mainly used as outdoor stone, its color naturally , can be well coordinated and the surrounding landscape, is ideally suited for the construction of outdoor landscape, in particular, is the best choice of stone ground floor. However,  basalt easy to form a hexagonal columnar joints, but brittle, generally small stone blocks, lack of big size block ,, is not easy to produce large-sized tiles .

Since many types of basalt, Fuding black (G684) for data prototype for everyone to make a reference:

Fuding black basalt (G684)
 
Bulk density: 2.9m3
 Compressive strength:  215.6MPa
 Flexural strength:  26.3MPa
 
 
 
Chemical composition
 
Silica  45.2%
 Titanium dioxide   2.31%
 Aluminum oxide  14.02%
 Ferric oxide   5.59%
 Ferrous oxide    The abrasion value Los Angeles Law (%)    8.2