Here are some of the pics of those rocks – taken with a digital camera instead of my built-in iSight.
This is where I found these guys – this is at the top of one of the low mountains (maybe 1300 ft elevation?) around this point on the maps (basically above the Galice river, and just to the north).
A few better pictures of the rocks, at least I hope a little better. I don’t have good color settings, so I’m sure the color correction is off a bit from the reality of these guys. The pictures are taken against my black (and now quite dirty) sweatshirt.
If you can shed any light on the geology that I’ve found, I’d appreciate it!
Rhonabwy 
Current theory is that lovely green is actually olivine basalt. The same stuff that makes a rather hidden, but very pretty, green sand beach in Hawaii.
LikeLike