This has been asked before (https://ball-pythons.net/forums/show...24-Weird-urate) no pic, but sounds the same. I don't think it's cause for concern either though.
I tried searching for similar, & only found this: https://azeah.com/recognizing-abnormal-feces But there's just so many variations on the norm.
Might even be something in the water that the snake consumed- or, have you added any minerals/vitamins to his food lately? Maybe something failed to get fully digested- for that matter, something the rodent ate?