Perhaps the shiniest shiny in the whole wide world, there is absolutely no way to get pics to really show how amazing this stone is.
They are rare Ammolite Fossils; an opalized version of Ammonite. They are full of amazing shimmer and flashes of bright, vivid colors that seem to burst in different patterns.
I tried real hard to capture some of what the different stones do with different angles of light. Indoors.