You are so lucky in getting your peridots!
I have both my caves breeding crystal and cactus trying to breed the peridot dragon, but it keeps on escaping me. Elusive little b*gger. I can't keep count on how many times I tried, sped it up quite a few times, but no peridot for me yet. I now have two moss dragons in my caves and it is tempting to speed up breeding time. And those crystals..... My goodness, such ugly little devils;-)
Oh well,, this is all part of the game! Happy breeding everyone. eventhough some might breed with a bit more frustration than others, hehe!