Yeah, I get like--I grow something like twice as big as I usually am, some spikes grow from my body, just get this rocky, gem-like skin. What I've figured out so far is I can sort of get a sense of the earth and rocky places around me, like where caverns and tunnels are, and I can meld into unworked stuff. So, not sidewalks, but yes just regular rock and earth. Generally just stronger.
This is all kind of fucking new, which is the whole experiment thing. I've had the shard since I was a kid, but it didn't wake up, I guess, until recent.