It's urate. How your tort gets rid of excess proteins. Passing urate is normal.
Passing urate that looks like that isn't normal. It should be like mucus not grit. Your tort is dehydrated.
You need to soak this tort for at least 30 minutes twice a day for the next week or so and then drop it to once a day.
Is water freely available in your tort's enclosure? Can we look over photos to see if there are any tweaks we would recommend