re: Comments on this flaky rock?
Hey, Buck.
That leaf reminds me of what I noticed here recently: Wherre Tipuna came apart at the bottom right, there are some similar features to your leaf.
I think all these rocks have clay properties associated with geothermal activity.
This is not the best example, but you can see where thin sheets of hot mud (mostly molten rock but yes there is water, yes acidic water that's associated with the thermal activity) tends to have that suspended curling feature as it cools.