Well that depends, the densest, or heaviest for the amount of space it takes up, is unoktonium. It has the highest atomic number and atomic mass of any known element. The heaviest single stone we know on earth that is not a land mass like Iceland or the Andes Mountains is probably Ayers Rock in Australia. The sandstone formation stands 348 m (1,142 ft) high (rising 863 m/2,831 ft above sea level), with most of its bulk lying underground, and has a total circumference of 9.4 km (5.8 mi).
The remarkable feature of Uluru is its homogeneity and lack of jointing and parting at bedding surfaces.
Technically the largest rock is probably a mineral based planet in another solar system.
I think that large asteroids are heavier than any rocks on Earth. I’m not sure if the largest asteroid has been named, but the second largest is Vesta.
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