A beautiful quartz cobble

I was walking back downhill towards ValleyRd and the "oven" of previous mention, and saw a few wall features, here a nice termination:

Right adjacent to it, I could not tell if this was a rock pile. There might have been another but too indistinct to photo (as if this one wasn't already).

Then I saw a nice quartz rock. It was loose in the leaves, so I think it fell off the wall recently:

 It shows some use wear.

 

Very pretty.