Rocks vary greatly in density and weight. A piece of pumice that size could weigh maybe an ounce, while a lead-laden rock may weigh many times that, maybe closer to a pound.
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it is the same weigh.
Natural rock for landscaping weighs between 1.4 and 1.7 tons
Marble is a type of rock and it exist in nature as a mountain or hill. There is no size limit for this answer. It can weight a few kg for construction marble cut to a few Gigaton of mountain rock.
It depends on what kind of rock it is.
I say 1.09 cu ft.