You are sure it's a rock? Otherwise acting and eating normal? I was given a sulcata who for months would every so often pass rocks and what appeared to be asphalt, but never noticed the urine being different.
Hot hot hot! Did I say it's hot? I don't do hot well. Thank goodness for that occasional cooling breeze. It's making me consider re-purposing the new large children's wading pool into my own cooling off zone. Lol
Your story is so much better then mine, when I got a slight scare coming around the tree in the path. Spotted a snake slithering across just infront of me... and mine wasn't a serious snake like yours.