Peacock ore/copper! Or more scientifically, Bornite (Chalcopyrite being the one that is real pretty most of the time).
http://www.nextinnovations.net/gemstone/rock_descriptions/peacock_copper/peacock_copper.htm
As you can see, the colors are all kinda jumbled together on this mineral. There is no ‘natural’ way to transition them… so Windstone’s way of ordering the colors is also unique.
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