Hi, Can anyone please help me identify this stuff? I'm finding chunks of it in the ground in the garden and under the deck in the house we just moved into. It's like a block of crumbly rock mixed in with the dirt. Then when you crush it with your hands it turns to powder very easily. Is it even a rock? Or is it a big blob of decomposing mould or something? Any ideas please? Here's a link of the rock not crumbled as I find it. And below is a link to the rock after I've squished it. It's easy as hell to crush, 2 fingers will do it. https://www.dropbox.com/s/9606jpqo5vumo70/WhiteRock1%20%281%29.JPG?dl=0 Crumbled rock https://www.dropbox.com/s/sp4siz4dndwk5la/WhiteRock1%20%282%29.JPG?dl=0 Cheers, Chris