Thanks, everyone. LOL
The moss is good old, standard, native northern Ontario moss. It was growing in the backyard in the shade. We're on solid clay here, so the grass gave up in that spot, and the moss moved in. And I relocated it.
The stone...that's an interesting one. It came from a local landscape supply business, they called it wormstone, for lack of a true name. I live at the eastern edge of Lake Superior, and grew up in the country. My dad built our house, and when the well was dug, they brought up the soil. The top of the pile they brought up was almost a pure white, powdery silt, like gray clay, but it didn't stick together. It came from a depth of 22feet. My brother and I played in it as kids. Above that, our land was almost pure sand. The company that I bought the stone from is based out of the same, small, rural community. I'll have to take some pics of just the rocks to really show the next bit. All the rocks are roughly the same height (as was the slab of about 6'x3' that I passed on when offered), the only difference being some rocks have a curved edge, from what appears to be erosion. They look like there are brown worms, in a different texture, running through the almost pur white rock. Some dont have the brown, but "wormholes" where the brown would be. I think this rock is the same white, silty stuff that came up from 22' down from my childhood well, and may have been lake bed, or just the surface of the ground in eastern the Lake Superior area. I suspect the wormholes were where plant roots were, when the silt was compressed by the glacier in the last ice age, and when the glacier retreated, it pulled the brown sand that is on the surface now, down into where the roots had been, and then, over time, that was compressed (10 to 20 feet of sand, possibly). A layer of silt compressed would make for pretty uniform rocks in depth. Anyway, that's my theory. I do know they are heavier than the local sandstone...Dad used that on the outside of my childhood home, and I had to help move a lot of it.
I'll get some pics close up in the morning. It's definitely neat rock.