Can't really tell from a photo. The combination of features is kind of odd, but possibly an example of the unusual 'cheetah agate' from Brazil? There are lots of possibilities though.
From the photo it looks to be an agate of some sort, with the classic banding and zones of macrocrystalline quartz. Possibly some sort of amethyst lace agate, but the purple that I think I'm seeing could be from dye as well (sadly common in agate).
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