A while back, an Internet friend of mine got a lovely little dragon. We're pretty sure he's crystal and not glass, but not totally sure, and none of us can figure out what he's made of. I've seen the material before and more frequently of late, and finally got curious enough to ask about it.

This is him. This pic doesn't really show off the iridescence, but he changes colors depending what light he's in and is slightly more transparent than he looks in this.
Anyone know what this is?