Board Thread:General Discussion/@comment-26239062-20150703060804/@comment-26239062-20150707225113

As for Steven only being strong when he's angry...he did lift Jenny pretty casually in Joy Ride and move some fairly heavy pieces of the ship in the same episode. One piece he pulled out looked to be about the same size as his body (without head or legs). While we can't really know what it's made of, it looks like stone, and limestone has a weight of 150 pounds per cubic foot. A 2 foot by 2 foot by 2 foot boulder (8 cubic feet) would weigh 1200 pounds.

If it was metal it would be much heavier.