Identify cut rock

Looks something like Portland Stone to me.....



Tell me, was the last renter a sculptor of some kind? Portland style stone is excellent for sculpting.

It could be anything of a dense carbonate. Its kinda porous though. (It asctually looks more like concrete slb). If you say you've got 2 cubic meters of concrete then its about 4800 kg , or about 10600lb (2.204 lbs per kg). Limestone is (avg) 2600 kg/M^3 or 52oo Kg (11500 lb)
So you've got a 5 to 5 1/2 ton hunk there. A normal Sky Trac can handle that. Shouldn't be much trouble since they've got a wooden brace holding it off the ground.

When you take pictures you should put something scaleable in the picture, (A hat, a lunchbox etc)

Greg my first reaction was concrete per Farmer above