This is from Essie’s Winter Collection: School of Hard Rocks. Essie describes it as a midnight malachite. I googled malachite because I had no idea what it was and that seems way greener, but either way, this is definitely my favorite of the Winter 2011 collection.
It only took 2 coats for full opacity and had a nice glossy finish. This may actually be one of my all time favorites from Essie. I don’t think I have another shade like it.