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You're right, it doesn't have any kind of BBW pattern I've seen. I compared close-ups of a few of my stones with my USB microscope set at 10-20x and I couldn't find a match. It does look somewhat...

Most here think it's a BBW because it looks like a BBW despite it not being the same color as your other BBW and gives purple slurry. BBWs are so common that the chance of a stone like that being...

It's the grey Special stone that sparkles iirc, I don't know whether that one gives off purple slurry. BBWs can come in pretty thick sizes. I have not seen any big Fox stones (yet).

Here are a...

BBWs can be more blueish and this one seems to be in the colour range. Some of mine are pretty smooth to the touch as well. It should have some kind of (3d) pattern characteristic for BBWs.