As usually,marble and grey,white granite the specific gravity is 1M3=2.6~2.8TON.
Black stone is usually 1M3=2.9~3.2TON.

  container quantity

1:for tile which is 6 sides sawn.

the normal port is allowed 27ton for one container,
thus, for marble and grey,white granite,one container could fill about 10M3,
black stone could feel about 9M3.

the calculation is  27ton/stone gravity=M3 for one container.

that's to say,
for 2cm tile which with edges sawn, 
marble and grey,white granite,one container could fill 480~500m2,
black stone could fill 430~450m2.

the calculation is M3 for one container/thickness of tile=M2 for one container

2: for slab,which with rough edges

for slab,as the slab length or width isn't fix, they usually change according to the block,
so,we have to obligate space for the quantity which can't calculated.  
for 2cm slab, one container is about 50~80M2 less than 2cm tile.

more information,will update in the following days.

any question or advise,pls no hesitate to contact us.