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What it looks like to me is that it has been slowly leaking for some time and the minerals in the water made a mineral deposit around the pipe. Yes, it is very hard to break those deposits, at least in my area. By the looks of the rest of the exposed pipe, you will have this issue again in the future. Maybe you will get a year out of it.

I suspect that when you get down to the pipe that is ruptured, you may find more damage than you expect. Buried pipe in Texas shouldn't freeze to a point of rupture, even at 6"-8" deep unless we have a freeze of many days (7-10 or more) of sub-freezing temps and even then it would have to be below 25 or so degrees the entire time. It sounds like you had a section of pipe either rust through if steel pipe, or had a fitting separate with ground movement. I wish you the best of luck in your repair.