Go over the bridge away from the CLEAVED MAIDEN' towards the Stewark Lands and you'll come to a large barn on your right and a transporter called 'STEWARK LANDS' just after that you'll see a sign and a path going left which says 'BEACH, follow that all the way down to the beach and turn right to the very end, see the butterflys by the rock? That's the FG piece.
Oh I forgot, look out for the 'raider field workers' they can be tough if you let them hit you, they'll take half your points in one bash so stand off and shoot them 4 times, try and hold you ground for the last shot and you'll do fine.
Btw, 'Forgotten Graves and other Item Quests all have butterflies flying over the location same as herbs etc..
Ok, the next one I found is as you go down the path from OTGERS fields after you dispose of the marauding field workers towards the barn on the Alchemist quest, follow the path down and it's on your right half way down.
So as you look on your map t I7 980 Extreme, Asus P7, 6GB Crucial 'dominator' DDR3 1600, Gainward GTX480.