Butterfly wing

My piece of Labradorite looks like a butterfly's wing.

I found this on the internet about the stone – the story makes it magical: According to an Eskimo legend, the Northern Lights were once imprisoned in the rocks along the coast of Labrador. It is told that a wandering Eskimo warrior found them and was able to free most of the lights with a mighty blow of his spear. Some of the lights were still trapped within the stone, and thus we have labradorite.

http://shimmerlings.com/gemstones/labradorite.htm