Snakeskin jasper comes from the Pilbara region of Western Australia. This deep red and white patterned stone is a banded iron formation. The location where it's found is home to one of the world's largest iron producers.
Banded iron formations are formed when iron rich sediments are expelled from underground vents into large bodies of water. As the iron settles it forms alternating layers which build up over millions over years. These gradually harden and the process of metamorphism then introduces interesting patterns and other features.
The area where snakeskin jasper is mined is believed to be around two and half billion years old.