that rock music had been around for so long? I found this greenish red sandstone rock with a green waxy looking rock wearing out of the top that looks like a guitar pick. It's even the right size. I used a diamond file around the outside edge of it (not against the "pick" itself), leaving a bit of the matrix around the "pick" to make it a bit more visible. It's 1.25 inches long x .75 inches wide. Edge on views show the stone to be layered with both the green rock and sandstone. Pic 4 is the back of the stone & Pic 5 is a close up of the "pick".