Normal feature:

1) Chinese marble, marble slab, black marble
2) Polished big slab, 2cm of thickness
3) Used for the indoor and outdoor decoration with the graceful, unique and
    classical effect 
4) This wonderful material is widely used in hotels, restaurants, houses and
    public building

Some detailed of Black Marquina as follow:

Phisical state :

shore scleroscope hardness(HSD): 64

bulk density:                                 2.80g/m³

water absorption:                           0.15 

Chemical composition:

Sio₂:                                            64

Cao:                                            50.75

Mgo:                                           2.68